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?
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.
Here is another way.
2x + 10 = 34
Solve for x.
To find out Tom's allowance before his tenth birthday, we can work backwards using the given information.
First, let's find out Tom's allowance when he turned 12. It was $34 per month.
Then, we know that Tom's allowance doubled on his 10th birthday. So, before his 10th birthday, his allowance was half of what it became on that day.
Let's calculate:
Tom's allowance on his 10th birthday = $34 / 2 = $17 per month.
Therefore, Tom's allowance before his tenth birthday was $17 per month.