Problems on Ages · Question 22 · Medium
The product of the present ages of two brothers is 140, and the elder is 4 years older than the younger. What is the younger brother's age?
- 14 years
- 10 years
- 7 years
- 12 years
Answer and explanation
Answer: B. 10 years
Explanation: x(x + 4) = 140 gives x² + 4x − 140 = 0, i.e. (x + 14)(x − 10) = 0. So the younger brother is 10 years old (the elder is 14).
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