Question
The ages of A, B and C are in the ratio 4:5:7 and the
sum of their ages is 80. Find the ratio of 15 years ago B’s age to C’s age after 10 years.Solution
Let the present age of A, B and C be 4x, 5x and 7x respectively. According to the question, => A + B + C = 80 => 4x + 5x + 7x = 80 => x = 5 B’s age 15 years ago = 5x – 15 = 25 – 15 = 10 C’s age after 10 years = 7x + 10 = 35 + 10 = 45 Required ratio = 10 : 45 = 2:9
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