Answer:
Slim is 10 years old
Explanation:
Let Jim's age = x
Tim's = x + 2 because Tim is 2 years older than Jim
Slim's = x - 5 because 5 years younger than Jim
x + x + 2 + x - 5 = 42
3x -3 = 42
3x = 45
x = 15
Slim's age is x - 5,
15 - 5 = 10
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