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Wednesday, April 26 2017 @ 10:49 AM CDT
 Forum Index >  Test Paper Related >  Primary 4 Matters
 RGS P4 Maths
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By: shin (offline)  Saturday, October 02 2010 @ 01:50 AM CDT (Read 1768 times)  
shin

Hi,

Kindly help to solve the below problem as my answer is difference from the answer sheet.

There are a total of 28 chickens and cows in a farm. If the total number of cows' legs is 40 more than the total
number of chickens' legs, find the number of

a) chickens in the farm and ( My answer is 9 but answer sheet is 12)

b) cows in the farm ( My answer is 19 but answer sheet is 16)


Appreciated and thanks

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By: LES (offline)  Sunday, October 03 2010 @ 09:54 AM CDT  
LES

Hi
My working would be guess and check.

There are 40 more cows legs so there should be at least 10 cows.

Using the guess and check method:

Cows (4 legs) Chicken (2 legs)

11 x 4 = 44 17 x 2 = 34
12 x 4 = 48 16 x 2 = 32
13 x 4 = 52 15 x 2 = 30
14 x 4 = 56 14 x 2 = 28
15 x 4 = 60 13 x 2 = 26
16 x 4 = 64 12 x 2 = 24

The difference of 64 and 24 you get 40 more cows legs.

Hope this helps.

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By: shin (offline)  Tuesday, October 05 2010 @ 09:18 AM CDT  
shin

Thanks alot Les

I have another question

The total mass of James, Lucy and David is 130kg. James is 1 1/2 times as heavy as Lucy and twice as heavy as David.
a) How heavy is James
b) How much heavier is James than Lucy ?

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By: joannng76 (offline)  Tuesday, October 05 2010 @ 09:58 PM CDT  
joannng76

Hi,

you could use models to solve
erm i dunno how to draw the model here so i will try and use words here and you draw it out ok?


James : 6 boxes
Lucy : 4 boxes
David : 3 boxes

total : 13 units = 130kg
1 unit = 10kg
James = 6 boxes = 60kg
James - Lucy = 2 boxes = 20 kg

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By: lemofish (offline)  Wednesday, October 06 2010 @ 11:15 PM CDT  
lemofish

Quote by: shin

Thanks alot Les

I have another question

The total mass of James, Lucy and David is 130kg. James is 1 1/2 times as heavy as Lucy and twice as heavy as David.
a) How heavy is James
b) How much heavier is James than Lucy ?



James: uuuuuu
Lucy: uuuu
David: uuu

13u=130kg
u=10kg

a) James is 6x10kg=60kg

b) Lily is 4x10kg=40kg
60kg-40kg=20kg
James is 20kg heavier than lily

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By: shin (offline)  Friday, October 08 2010 @ 09:42 AM CDT  
shin

Thanks alot for your help, Joannng & lemofish

Big Grin

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