# A family in Singapore part 25 (Math Question)

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The blog postings are about the Singapore Math. The readers can learn from the postings on Solving Singapore Primary School Mathematics that teaches in Singapore Primary Schools. You or your kids can learn the skills of dealing with Math Modeling, Math Problem Solving, 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 Fraction, 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.

Should read also the posting on Sarin learns the concept of Fraction (mathematics concept) to understand the concept of Fraction.

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

Upper primary school mathematics question UPQ292

The average mass of Hairu and Fatimah is 49 kg. The average mass of Fatimah and Sarin is 79 kg. Hairu is 1/4 as heavy as Sarin. Find Hairu’s mass.

Solution:

Total mass of Hairu and Fatimah = 2 × 49 = 98kg

Total mass of Fatimah and Sarin = 2 × 79 = 158kg

Hairu’s mass is ¼ fraction of Sarin’s mass

Draw the model

Per the model

3 units = 158 – 98 = 60

1 unit = 20 kg

The mass of Hairu = 20 kg