A girl is 18 years old and her brother is a third her age. When the girl is 36, how old will the brother be?

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Multiple Choice

A girl is 18 years old and her brother is a third her age. When the girl is 36, how old will the brother be?

Explanation:
The key idea is that the difference in age between two people stays the same over time. Here, the girl's age is 18 and her brother is one-third of that, which is 6. The gap between them is 18 − 6 = 12 years. As they both age, this 12-year difference remains constant. When the girl is 36, she has aged 18 more years, so her brother also ages 18 more years: 6 + 18 = 24. So the brother will be 24 when the girl is 36.

The key idea is that the difference in age between two people stays the same over time. Here, the girl's age is 18 and her brother is one-third of that, which is 6. The gap between them is 18 − 6 = 12 years. As they both age, this 12-year difference remains constant. When the girl is 36, she has aged 18 more years, so her brother also ages 18 more years: 6 + 18 = 24. So the brother will be 24 when the girl is 36.

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