Welcome to Test-paper.info
Saturday, February 24 2018 @ 07:56 PM CST
 Select a Forum » General Chat » Primary 1 Matters » Primary 2 Matters » Primary 3 Matters » Primary 4 Matters » Primary 5 Matters » Primary 6 Matters » Question, Feedback and Comments » Education Classified
 Forum Index >  General Chat >  General Chat primary 4 maths
 | Printable Version
 By: thayal (offline)  Monday, April 05 2010 @ 08:26 AM CDT (Read 1529 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

3291-132=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.
PROBLEM-Solving Processes in Mathematics Primary 4
by Fabian Ng

Junior

Registered: 12/31/06
Posts: 18

 All times are CST. The time is now 07:56 pm.
 Normal Topic Locked Topic Sticky Topic
 New Post Sticky Topic w/ New Post Locked Topic w/ New Post
 View Anonymous Posts Able to Post HTML Allowed Censored Content