# Can anyone get this tricky math problem?

Discussion in 'Community Discussion' started by Frisco, Feb 8, 2008.

1. ### Frisco macrumors 68020

Joined:
Sep 24, 2002
Location:
Utopia
#1
Just for fun, not for class. I can't get it.

Good luck with this and have fun! This is a 5th grade math problem.
If you can't stand word math problems, just delete now. If you can open the
spreadsheet, you'll see it's a very small list of people who have gotten
the correct number. This is not a trick question. This is a real math
problem so don't say that a bus has no legs.

There are 7 girls in a bus

Each girl has 7 backpacks

In each backpack, there are 7 big cats

For every big cat there are 7 little cats

Question: How many legs are there in the bus?

The number of legs is the password to unlock the Excel sheet. (Do not have to spell out #)
If you open it.

Joined:
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Location:
Bay Area, CA
3. ### Frisco thread starter macrumors 68020

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#3
Dude no spam here!

Joined:
Dec 7, 2002
Location:
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5. ### mactastic1971 macrumors regular

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Jan 9, 2008
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Bay Area, CA
#5

If you were a spammer, and somebody asked you if you were a spammer would you reply, "no I am not a spammer" ?

6. ### Frisco thread starter macrumors 68020

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Utopia
#6
I have been a member since 2002 and just start spamming now? Answer the question or move on

7. ### EricNau Moderator emeritus

Joined:
Apr 27, 2005
Location:
San Francisco, CA
#7
I got 9604.

7 girls x 7 backpacks x 7 big cats = 343 big cats x 7 little cats = 2401

2401 x 4 legs each = 9604

...but it's wrong.

EDIT: forgot the girls. 2401 + 7 = 2408 x 4 = 9632 ...but that's wrong too!

8. ### mactastic1971 macrumors regular

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Jan 9, 2008
Location:
Bay Area, CA
#8
girls have 2 legs - not four

9. ### swiftaw macrumors 603

Joined:
Jan 31, 2005
Location:
Omaha, NE, USA
#9

7 girls * 2 legs each = 14 legs

7 backpacks per girl = 49 backpacks
7 large cats per backpack = 343 large cats = 1372 legs on the large cats

7 small cats per large cat = 2401 small cats = 9604 legs in the small cats.

Total legs = 9604+1372+14 = 10990

10. ### Dros macrumors 6502

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Jun 25, 2003
#10
Plus 14 girl legs.

edit: uhh, as the above said.

11. ### Frisco thread starter macrumors 68020

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Sep 24, 2002
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Utopia
#11
Thank you so much!!! I would have never gotten it.

ps: No spam here

12. ### dobbin macrumors 6502a

Joined:
Jan 28, 2002
Location:
England
#12
I don't see why this is at all hard. It seems very simple to me.

7 girls --> 14 legs
7x7 = 49 backpacks
49x7 = 343 big cats --> 1372 legs
343x7 = 2401 little cats --> 9604 legs
14+1372+9604 = 10990 legs in total

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14. ### EricNau Moderator emeritus

Joined:
Apr 27, 2005
Location:
San Francisco, CA
#14
Looks like I also forgot to account for the big cat's legs. That's what I get for talking on the phone while doing a math problem, I suppose.

But what about the bus driver?

15. ### Frisco thread starter macrumors 68020

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Location:
Utopia
#15
Well it was very hard for me. I was never good at math.

ps: I was multiplying in the wrong order: Big cats--little cats really confused me.

### Staff Member

Joined:
Sep 19, 2002
Location:
Los Angeles
#16
That puzzle sounds like yet another variation on this classic, thought to have originated in 1650 BC!

How 'bout this puzzle? -

A bookshelf has three encyclopedia volumes: A-I, J-R, and S-Z. They are in the usual order, left to right on the shelf. The covers are 1/16" thick. Each book has pages numbered 1 to 1000. Each sheet of paper is 1/250 of an inch thick.

If a bookworm chews its way from page 1 of the A-I volume through page 1000 of the S-Z volume, how far did it travel?

(You may decide whether or not the bookworm ate the starting page and the ending page; use whichever assumption makes your computation easier.)

17. ### swiftaw macrumors 603

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Jan 31, 2005
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Omaha, NE, USA
#17
6.25 inches

18. ### EricNau Moderator emeritus

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Apr 27, 2005
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San Francisco, CA
#18
Maybe I'm miss-reading the problem, but wouldn't it be 12.25 inches?

19. ### swiftaw macrumors 603

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Jan 31, 2005
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Omaha, NE, USA
#19
Nope, how many pieces of paper needed to make 1000 pages?

20. ### EricNau Moderator emeritus

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San Francisco, CA
#20
Well, if you think like me, 1000.

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Location:
New Zealand
#21
2.25".

22. ### yippy macrumors 68020

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Mar 14, 2004
Location:
Chicago, IL
#22
That would be 12.25"

There are 3000 pages total, 1000 for each of the 3 books.

23. ### swiftaw macrumors 603

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Jan 31, 2005
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Omaha, NE, USA
#23
how many pieces of paper needed to make 1000 pages?

24. ### monke macrumors 65816

Joined:
May 30, 2005
#24
Agreed.

1000 pages = 500 sheets. 1 page on one side, 1 page on the other.
The worm chews through 500 sheets in the A-I book, then the cover.
It then chews through the J-R front cover, 500 sheets, and the back cover.
Then the S-Z cover, 500 sheets, and it stops dead.

Joined:
Apr 1, 2005
#25
500....