# Maths problem

help me as my brain has gone to mush...

1 to 20 of 72 messages
iron fraggle    pirate
03/04/2008 at 11:29

helping out at school today we were doing a maths game  - its like the numbers game on Countdown.

You have 4 numbers and you have to use + - x / to get the answer 24

eg 6 4 7 7  you can say 6x4 = 24, and 1/1=1 and 24x1=24

now, we got the numbers 9 8 8 & 4 and I can't work out how to get 24

over to you brainboxes....

03/04/2008 at 11:31
4x8 =32 - 8 =24
PloddingOn    pirate
03/04/2008 at 11:31

03/04/2008 at 11:32

9-8 = 1

4-1 = 3

3 x 8 = 24

Is that what you mean?

03/04/2008 at 11:34

This ones a bit harder.

A cow is tied to the fence of a perfectly circular grass covered field.  How long would the rope have to be for the cow to eat exactly half the area of the field?

PloddingOn    pirate
03/04/2008 at 11:35
Give the cow some scissors and let him cut the rope?
03/04/2008 at 11:36

9-4 = 5

8-5 = 3

8*3 = 24

or all in one line (8  - (9-4))*8

03/04/2008 at 11:36

9 x 4 = 36;   8+8=16 -4 =12 --------- 36-12=24

03/04/2008 at 11:36
It's a cow!
03/04/2008 at 11:36

Tut tut, online plagerism....

bend over.

iron fraggle    pirate
03/04/2008 at 11:37

No you have to use all of the numbers

this isn't my homework, but it's annoying me that I couldn't work it out

JB - isn't that a how long is a piece of string type question

Stump    pirate
03/04/2008 at 11:38
Given that the cow doesn't have thumbs

Is the cow tied to the fence on the edge of the field or to a pole in the middle

Do you know anything about the size of the entire field?
03/04/2008 at 11:38
I did use all of the numbers?
iron fraggle    pirate
03/04/2008 at 11:38

use all the numbers once

(and htese 11 yr olds aren't clever enough to use brackets yet!)

iron fraggle    pirate
03/04/2008 at 11:39

Aha  - get you point Mouse!  yes that would work wouldn't it

vitual choccy on it's way to you

PloddingOn    pirate
03/04/2008 at 11:40

Sharpen the cows teeth, put some grass on the rope, allow the cow to munch through the rope and then leave it aforementioned field to eat the grass.

Does that get past the no thumb problem?

03/04/2008 at 11:40
iron fraggle    pirate
03/04/2008 at 11:40

.

Edited: 03/04/2008 at 11:41
03/04/2008 at 11:44

Closest I've managed so far is 28.

03/04/2008 at 11:48
A bit longer than the distance to the centre, jb
1 to 20 of 72 messages