
By: thayal (offline) Monday, April 05 2010 @ 08:26 AM CDT (Read 1492 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?

Junior
Registered: 04/18/09 Posts: 21





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?

Junior
Registered: 03/27/10 Posts: 19





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



kohkah 
3291132=3159
3159/9=351
since chickens has 5 parts, so = 351*5=1755 chickens

Newbie
Registered: 12/31/06 Posts: 7





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?

Junior
Registered: 03/27/10 Posts: 19





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.

Newbie
Registered: 12/31/06 Posts: 7





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 ?

Junior
Registered: 04/18/09 Posts: 21





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



tanhuimin 
I'm using this book, quite good.
PROBLEMSolving Processes in Mathematics Primary 4
by Fabian Ng

Junior
Registered: 12/31/06 Posts: 18



