Maths help please
 

Subscribe now and choose from over 30 free gifts worth up to £49 - Plus get £25 to spend in our shop

[Closed] Maths help please

19 Posts
13 Users
0 Reactions
99 Views
Posts: 0
Free Member
Topic starter
 

I'm trying to work out the following equation:

I one person tagged one person a day for ten days and told each person they had to tag ten people, after 10 days how many people would have been tagged??

I'm not great at maths but this has fried my brain.


 
Posted : 05/06/2020 3:16 pm
Posts: 13594
Free Member
 

Assuming the tagged people didn't have to pass on the tagging message....

Person 1 tagged 10 people (1 per day for 10 days)

Each of those 10 tagged, then went off and tagged 10 other people (however, we don't know in what time frame, is it one per day or 10 asap).

So anywhere between 10 and 110....

If the initial 10 then told their victims to tag 10 and pass it one, will be much more....


 
Posted : 05/06/2020 3:25 pm
Posts: 0
Free Member
 

It's not a very clearly specified problem, could be interpreted in different ways.

1. I one person tagged one person a day for ten days = 10 people tagged
2. told each person they had to tag ten people = another 100 people tagged (but no timeframe given)

10 + 100 = 110


 
Posted : 05/06/2020 3:25 pm
Posts: 17303
Free Member
 

Ten, assuming that everyone else told the first guy to piss off and grow up a bit.

but 110.

10 for the initial guy and 10 each for his 10 victims


 
Posted : 05/06/2020 3:26 pm
Posts: 0
Free Member
Topic starter
 

sorry, it's relative to that awful tag someone on facbook to nominate an album/photo crap thing.

I suppose the anser is recurring because it never stops, but the question is if I nominate one person a day and they had to then further nominate a person a day for ten days, how many people would have posted crap photos in ten days.


 
Posted : 05/06/2020 3:27 pm
Posts: 17303
Free Member
 

Ah! in which case the official UK Government answer is "three hundred thousand, and thirty four, nine hundred and seventy four thousand"


 
Posted : 05/06/2020 3:31 pm
Posts: 0
Free Member
 

That changes the problem completely.

You tag 10. Next person tags 9, etc. until final person tags 1. Total = 55

Edit. Not thinking clearly.
You tag 10.
Each of those people tag 9. (90)
They tag 8 (720)
They tag 7 (5040)
They tag 6 (30240)
They tag 5 (151 200)
They tag 4 (604 800)
They tag 3 (1 814 000)
They tag 2 (3 628 000)
They tag 1 (3 628 000)

Add those up and you have the answer


 
Posted : 05/06/2020 3:31 pm
Posts: 4626
Full Member
 

Assuming that it's a scenario where each tagged person starts their own chain, its 2 to the power of 10, which is 1024, including the original tagger. To help visualise it:

New Total
Day 1: 1 2
Day 2: 2 4
Day 3: 4 8
Day 4: 8 16
Day 5: 16 32
Day 6: 32 64
Day 7: 64 128
Day 8: 128 256
Day 9: 256 512
Day 10: 512 1024


 
Posted : 05/06/2020 3:37 pm
Posts: 0
Free Member
 

I had beer for lunch. Changed my mind again, but need a nap. Ignore what I wrote above.


 
Posted : 05/06/2020 3:48 pm
Posts: 8699
Full Member
 

Ah! in which case the official UK Government answer is “three hundred thousand, and thirty four, nine hundred and seventy four thousand”

Sounds absolutely ‘world beating’ but in the real world the answer is in fact twenty six


 
Posted : 05/06/2020 3:57 pm
Posts: 77687
Free Member
 

This sounds like deliberately ambiguous Facebook click-bait. Let's break it down.

I one person tagged one person a day for ten days

So they've tagged ten people overall (assuming they've not tagged the same person ten times over).

and told each person they had to tag ten people

You've told ten people to tag ten people. That's another 100 tags, again assuming no duplicates or trickery.

after 10 days how many people would have been tagged??

So that's 10+100=110 people.

It looks at first glance like a recursion puzzle, where after ten days you've tagged the entire population of the globe or something*, but that's not what it asks and if that's what it's supposed to mean then it's really badly worded.

(* - an interesting thought experiment during a pandemic).


 
Posted : 05/06/2020 4:16 pm
Posts: 77687
Free Member
 

sorry, it’s relative to that awful tag someone on facbook to nominate an album/photo crap thing.

Ah, just saw your follow-up.

Day 1. One person nominates 10.
Day 2. 10 people nominate 100, or 10^2.
Day 3. 100 people nominate 100, or 10^3.
...
Day 10. 10^9 people nominate 10^10 people.

So that's 10^0 + 10^1 + 10^2 + ... + 10^10 people in total. We started with 1, at the end of day 1 gave us 11, day 2 111. So the answer is that for n days your answer will be a number consisting of n+1 1s (including your original tagger).

In practice it probably won't be anything like as big a number because people share friends and there will be duplicates, and because a lot of people will just ignore it.

... I think.


 
Posted : 05/06/2020 4:27 pm
 teef
Posts: 0
Free Member
 

at the end of day 1 gave us 11

Only 10 - first person wasn't tagged


 
Posted : 05/06/2020 6:19 pm
Posts: 0
Free Member
 

So anywhere between 10 and 110….

I’d have said from 11 to 110 inclusive.


 
Posted : 05/06/2020 6:21 pm
Posts: 8328
Full Member
 

Has no one picked up the fact that you can't know if one person may be tagged by more than one other person? You can't calculate an answer for the question as written as it doesn't ask how many tagging events but how many people and it doesn't preclude a person being tagged twice.

It's not a maths question, it's a can you read and understand what's in front of you test.


 
Posted : 05/06/2020 6:25 pm
Posts: 12679
Free Member
 

Eh... You're all wrong.

One person tags one person on day one and tells them they have to tag one person per day.

At no point does anyone say they are allowed to wait until the next day.

So the answer is ALL the people get tagged on the first day. assuming none can be tagged twice.


 
Posted : 05/06/2020 6:29 pm
Posts: 0
Free Member
 

Is this one of those pyramid schemes where the first tag loads but everyone else runs out of people to tag, and just tag each other?


 
Posted : 05/06/2020 7:49 pm
Posts: 8941
Free Member
 

Benpinnick has given you the answer and yet you keep arguing about it
Assuming no duplications and assuming everyone plays along (why on earth do people bother with those daft facebook games?) At least the OP is asking a sensible question, those ones which cropping up on there with the pictures which seem designed to stir up arguements from people who don't understand what BIDMAS is really annoy me.
Anyway, to explain Ben's answer in more detail...
So, one person tags one other person on each of the next ten days, ten people in total, the tagged people then each tag ten more people, one on each of the next ten days and so on. It's not obvious from the first post but he explains better later
.
Day 1. The First person tags the second person. Total people = 2 (total people tagged will always be one less than this as person one wasn't tagged)
.
Day 2. The first person tags his second one, the second person tags their first. So two more tagged, total people = 4
.
Day 3. The first person tags his third, the second person tags his second, the two new ones tagged yesterday each tag their first. So four more people tagged, total people = 8.
.
Day 4. The first person tags his fourth, the second person tags his third, the two tagged on Day 2 each tag their second and the four new ones from Day 3 each tag their first. So eight more people tagged, total tagged = 16.
.
I can't be bothered but you get the jist.
.
Day 10. The first person tags their tenth and final person, the second person their ninth, etc,etc.
.
Day 11. (which doesn't count for anything as the OP wanted it after ten days) The first person tags no-one, he's already done his ten, the second person tags his tenth and final person, etc,etc
.
So
Day 1. 2 people
Day 2. 4 people
Day 3. 8 people
Day 4. 16 people
Day 5. 32 people
Day 6. 64 people
Day 7. 128 people
Day 8. 256 people
Day 9. 512 people
Day 10. 1024 people
The number tagged is always one less than the total involved so 1023 is the answer the OP wanted, the number of people tagged after ten days.


 
Posted : 06/06/2020 1:49 am
Posts: 0
Free Member
 

What if someone tags a law enforcement officer and they go berserk and tag the **** out of everyone in sight?


 
Posted : 06/06/2020 4:58 am
Posts: 0
Free Member
 

Benpinnick has given you the answer and yet you keep arguing about it

That all looks lovely and logical, but doesn’t appear to answer the original question. You appear to have made presumptions.


 
Posted : 06/06/2020 8:53 am