# A family in Singapore part 39 (Math Question)

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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, Math Questions with solutions that teaches in Singapore Primary Schools. You or the kids will able to acquire knowledge of dealing with Math Modeling, Math Problem Solving and 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 Average Number and Problem Sum.

You should read the posting on Sarin learns Average Number, Percentage and Charting in school (Math Concept) to understand the concept of Average Number.

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

Upper primary school mathematics question UPQ345

The average mass of Hairu and Sarin is 80 kg. The average mass of Fatimah and Sarin is 69 kg. The average mass of the 3 of them is 72 kg. Find the mass of Sarin.

Solution:

Draw the total weight models base on the combination

Average weight of Hairu and Sarin is 80kg

Average weight of Fatimah and Sarin is 69kg

The average of three of them is 72kg

The mass of Sarin = 160 + 138 – 216 = 82kg