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

You can read the posting** ****Sarin learns Symbol, Algebra and Equation in school (Math Concept)**** **to understand the concept of Algebra.

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 UPQ399**

Hairu is 1/5 as old as his father now. In 8 years’ time, he will be 1/3 as old as his father. How old is Hairu now?

Solution:

After 8 years, both Hairu and his father will be 8 years older

Hairu will be 1/3 as old as his father

Since Hairu is 1/5 as old as his father now

A yellow block above is Hairu today’s age (Green block) plus 8 years

From the model

1 unit = 8 year

Hairu is 8 years old now

Alternative solution:

Using algebra and equation

Set Hairu age now as H

Father’s age now = 5H

Hairu’s age after 8 years = H + 8

Father’s age after 8 years = 5H + 8

Hairu is 1/3 as old as father

Another word, father is 3 times older than Hairu after 8 years

3 (H + 8) = 5H + 8

3H + 24 = 5H + 8

2H = 24 – 8 = 16

H = 8 years

Hairu is 8 years old now.

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