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Tuesday, August 22 2017 @ 01:44 PM CDT
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 primary 4 maths
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By: thayal (offline)  Monday, April 05 2010 @ 08:26 AM CDT (Read 1458 times)  
thayal

Hi could anyone of you help me solve and explain this problem?
There are 3291 chickens and ducks. The farmer sold 2/5 of chickens and 132 ducks. The number of chickens became 3/4 the number of ducks. How many chickens were there at first?

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By: belle (offline)  Wednesday, April 07 2010 @ 02:26 AM CDT  
belle

i'll like to help but i'm stumped too... does anyone else know how to solve this?

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By: kohkah (offline)  Thursday, April 08 2010 @ 03:33 AM CDT  
kohkah

3291-132=3159
3159/9=351
since chickens has 5 parts, so = 351*5=1755 chickens

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By: belle (offline)  Thursday, April 08 2010 @ 03:59 AM CDT  
belle

oh i see, thanks. but how did u arrive at adding both denominators of 5 & 4 to get 9, instead of multiplying them to get common denominator?

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By: kohkah (offline)  Thursday, April 08 2010 @ 04:10 AM CDT  
kohkah

As the question mentioned,
the remaining 3/5 of chickens is = 3/4 of the ducks!

if the numerator are equal, it means parts/units (in block model) of chickens and ducks are in same size/quantity.




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By: thayal (offline)  Sunday, April 11 2010 @ 07:37 AM CDT  
thayal

Excellent , thanks for your clear explanation . by the way did you come across any book which explains all the problem models for the primary ?
Laughing Out Loud

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By: tanhuimin (offline)  Thursday, April 15 2010 @ 02:34 AM CDT  
tanhuimin

I'm using this book, quite good.
PROBLEM-Solving Processes in Mathematics Primary 4
by Fabian Ng

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