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

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

Upper primary school mathematics question UPQ413

Sarin is 5 years old. His mother is 33 years old. In how many years’ time will his mother be thrice as old as he?

Solution:

After Y year, Sarin’s mother is thrice as old as Sarin.

The model

From the model

2Y = 33 – 5 – 5 – 5 = 18

Y = 9

After 9 years’ time his mother will be thrice as old as him.

Alternative Solution(1):

By Algebra and equation:

Set after Y years, Sarin’s mother age will be 3 times of Sarin’s age

Sarin’s age after Y years = Y + 5

Sarin’s mother age after Y years = Y + 33

3 times of Sarin’s age = 3 (Y + 5) = 3Y + 15

Therefore,

3Y + 15 = Y + 33

2Y = 18

Y = 9

After 9 years’ time his mother will be thrice as old as him.

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