Asked by anonymous

On his 10th birthday, Tom's allowance was doubled. When he turned 12, his allowance increased by $10 to $34 per month. What was Tom's allowance before his tenth birthday?
Answered by Jay
34 per month minus 10 per month is 24. 24 divided by 2 (it was doubled on his 10th Bday) is 12 per month. Just do it backwards.

answer is 12 per month.
Answered by PsyDAG
Here is another way.

2x + 10 = 34

Solve for x.
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