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A girl is 21 years old and her brother is a third her age. When the girl is 36, what will be the age of her brother?

Respuesta :

the answer is 22 because 21÷3=7 which is the brothers age so the girl is 15 years older than him because 22-7=15 so when she is 36 the boy will be 22 because 7+15=22

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