Let the father’s age be F, which equals children’s sum S. In 20 years, children gain 4 × 20 = 80 years: F + 80 = 2(F + 20). This gives F + 80 = 2F + 40, so F = 40 years.
Ganita Manjari Part 2 Class 9 Maths chapter 13 question answer
Class 9 Maths Ganita Manjari Part 2 chapter 13 Two Variables, One Line solutions
Let the father’s present age be F and the sum of the ages of his four children be S, so F = S. In 20 years, the father’s age becomes F + 20, while each child ages 20 years, increasing their sum by 4 × 20 = 80 to S + 80. The condition gives S + 80 = 2(F + 20). Substituting S = F yields F + 80 = 2F + 40, resulting in F = 40 years.
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