Question : The ratio of A's age to B's age is $4:3$. A will be 26 years old after 6 years. The age of B now is:
Option 1: $19\frac{1}{2}$ years
Option 2: $12$ years
Option 3: $21$ years
Option 4: $15$ years
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Correct Answer: $15$ years
Solution : Let the present ages of A and B be $4x$ and $3x$ respectively. According to the question, $4x + 6 = 26$ ⇒ $4x = 20$ $\therefore x = 5$ So, the present age of B = 3 × 5 = 15 years Hence, the correct answer is $15$ years.
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