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CBSE Class 9 Answered

John age is 10 years less than three times his son’s age. If John son is 20 years old, then how old is John?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
answered-by-expert Expert Answer
Let us assume that John age is x years and his son’s age is y years.
A linear equation in two variables can be formed to represent the given statement as
 x = 3y – 10
 
We know that the age of John’s son is 20 years. This implies that the value of y is 20.
            Substituting this value of y in the equation x = 3y – 10, we get:
            x = 3 × 20 – 10
            Þ x = 60 – 10
            Þ x = 50
            Thus, John’s age is 50 years.
Answered by | 04 Jun, 2014, 03:23: PM

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