Tuesday, March 17, 2009

Dear Readers

Thank you for posting all the comments and questions. My primary goal of this blog is to show my readers that most (I would think 90%) of the primary school maths questions can be solved using model based approach. I hope you can learn some of the tricks along the way and able to guide your kid in their problem sum

FYI, I will try to answer your questions if you also give it a try.

Hope this blog can help the parents as well as the kids.

Monday, March 16, 2009

Primary 6 Problem Sum


A box contained 50¢ coins and 20¢ coins in the ratio 2:3. When I took out four 50¢, exchanged them for 20¢ coins, and put then put the money back into the box, the ratio became 2:7. Find the sum of money in the box.