Question
The ratio of age of ‘B’ after 6 years from now and
age of ‘C’ 8 years ago from now is 7:4, respectively. The present age of ‘C’ is 30% of the present age of ‘A’. If present age of ‘A’ is 40 years then find the present age of ‘B’.Solution
Given Data: Present age of A=40, Present age of C=0.3×40=12, Ratio of B's age after 6 years to C's age 8 years ago is 7:4. Equation: 
Substituting C=12:
Solve for B + 6 = 7 ⟹ B = 1.
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