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Al is ten years older than his brother Jerry. There was a time when Al was three times as old as Jerry. What was Jerry's age when Al was three times as old?

User A Haworth
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Answer:

Jerry was 5 years old

Explanation:

let Jerry's age = x

Al's age = x + 10

as per given in the question,

x + 10 = 3x

3x - x = 10

2x = 10

x = 10/2 = 5

User Traveler
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