The ages of two persons differ by 16 years. If 6 years agao, the elder one be 3 times as old as the younger one, find their present ages.
Choose the correct choice from the following answers:
A) 20 years.  B) 30 years.  C) 40 years.  D) 50 years.  E) 60 years.
Sol.   Let the age of the younger person be x years.   Then, age of the elder perosn = (x + 16) years.   ∴ 3(x - 6) = (x + 16 - 6) ⇔ 3x - 18 = x + 10   ⇔ 2x = 28 ⇔ x = 14   Hence, their present ages are 14 years and 30 years.   Answer 30 years.
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The ages of two persons differ by 16 years. If 6 years agao, the elder one be 3 times as old as the younger one, find their present ages.