SOLUTION: Tom's mother gave birth to Tom when she was 21 years old. how old will Tom be when his mother's age is 4 times of his age?

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Question 972276: Tom's mother gave birth to Tom when she was 21 years old. how old will Tom be when his mother's age is 4 times of his age?
Answer by amarjeeth123(569) About Me  (Show Source):
You can put this solution on YOUR website!
Let the number of years be x.
We have 21+x=4x
3x=21
x=7
Tom will be 7 years old when his mother is 4 times his age.