Question
Present ages of βAβ, βBβ and βCβ are in the
ratio 8:9:12, respectively. If present average age of βAβ and βCβ is 20 years, then find the age of βBβ when βCβ was 20 years old?Solution
Let the present ages of βAβ, βBβ and βCβ be β8xβ years, β9xβ years and β12xβ years, respectively. ATQ; (12x + 8x) Γ· 2 = 20 Or, 20x = 40 So, x = 2 So, present age of βCβ = 12 Γ 2 = 24 years Present age of βBβ = 9 Γ 2 = 18 years Difference between the ages of βBβ and βCβ = 24 β 18 = 6 years So, age of βBβ when βCβ was 20 years old = 20 β 6 = 14 years
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