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OpenStudy (anonymous):
When Tim started football 3 years ago, his coach was twice his age. Currently, Tim's coach is 10 years older than him. How old is Tim now?
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OpenStudy (anonymous):
The second sentence tells you the difference in age between Tim and his coach. Tim's coach is 10 years older than Tim. This tells us that when Tim's coach was twice his age, his coach was 20. Then we know that Tim was 10 three years ago. To get his age now, we take 10 +3 to get 13.
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