please explain 13th question.
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Let the present age of the son be x and the present age of father be 3x.
Age of son before 5 years = x - 5
Age of father before 5 years = 3x - 5
7(x - 5) = 3x - 5
7x - 35 = 3x - 5
7x - 3x = -5 + 35
4x = 30
x = 30/4 = 7 years 6 months
Therefore, present age of son = 7 years 6 months
Present age of father = 90/4 = 22 years 6 months
Age of son before 5 years = x - 5
Age of father before 5 years = 3x - 5
7(x - 5) = 3x - 5
7x - 35 = 3x - 5
7x - 3x = -5 + 35
4x = 30
x = 30/4 = 7 years 6 months
Therefore, present age of son = 7 years 6 months
Present age of father = 90/4 = 22 years 6 months
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