The blog postings are about the Singapore Math. The readers can learn from the postings about Solving Singapore Primary School Mathematics. The blog presenting the Math Concept, the Math Questions with solutions that teaches in Singapore Primary Schools. You or the kids will able to acquire knowledge of dealing with the Math Modeling, the Math Problem Solving and the Problem Sum from Lower Primary School to Upper Primary School level after reading the blog postings. This posting is an upper primary school math question on Ratio and Problem Sum.

You can click here and read the posting **A family in Singapore** about Sarin’s family.

Read also the posting on **Sarin learns the concept of Ratio in School (mathematics concept)**** **to understand the concept of Ratio.

*Challenge yourself with the question before look for the given solution‼!*

**Upper primary school mathematics question UPQ467**

The ratio of Sarin’s mass to Hairu’s mass is 5 : 4. If Sarin loses 1 kg and Hairu gains 5 kg, both of them will have the same mass. What is Sarin’s original mass?

Solution:

Draw a model based on their original mass ratio

They have the same mass finally

From the model

1 unit = 5 + 1 = 6 kg

The original mass of Sarin = 5 × 6 = 30 kg

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