Posted by **Peter** on Saturday, February 7, 2009 at 10:08pm.

1. a number increased by 21 is 28. find the number

2. a number decreased by 12 is equal to 30. find the number.

3. 8 less than a number is 15. fid the number

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**Ms. Sue**, Saturday, February 7, 2009 at 10:54pm
See my previous answer to this question.

http://www.jiskha.com/display.cgi?id=1234058590

- math help -
**Frances**, Friday, June 8, 2012 at 12:05am
can you help me solve this answer and explain it to me.

twice a number plus 7 equal 9

- math help -
**Frances**, Friday, June 8, 2012 at 12:08am
twice a number plus 7 equals 9

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