Matthew’s dad is 5 times as old as him. If the difference of their ages is 28, how old is Matthew?

7

Explanation

Let Matthew’s age be x. Then Matthew’s dad is 5x years old. The difference of their ages is 28. Therefore 5x – x = 28. Solving this equation we get, 4x = 28; x = 7. So Matthew is 7 years old.

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