# Sarin and his mother Part 4 (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, the Math Questions with solutions that teaches in Singapore Primary Schools. You or the kids can learn the skills to deal 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 Average Number and Problem Sum.

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

Challenge yourself with the question before looking out for the given solution‼

Upper primary school mathematics question UPQ469

The average age of Sarin and his mother was 22 years old six years ago. Given that he is now one third of his mother’s age, how old is Sarin now?

Solution:

The total age of Hairu and her mother now = 2 × 22 + 2 × 6 = 56 years

Sarin’s age is one third of his mother now

The model

From the model

4 units = 56

1 unit = 14 years

Sarin is 14 years old now.