Posted by **Julie** on Sunday, October 18, 2009 at 7:41pm.

I am a parent of a 10 year old, 5th grader and my hubby and I just can't figure these out to help her. Anyone?? Thanks in advance.

27 = 8k divide k = ??

5a - 3a = 18 a = ??

12r - 4r = 48 r = ??

g = 7(10-3) g = ??

These are finding the unknown number in each equation.

Thanks so much

- Math -
**Ms. Sue**, Sunday, October 18, 2009 at 7:55pm
27 = 8k

Divide both sides of the equation by 8.

27/8 = k

3.375 = k

______________________________________

5a - 3a = 18

2a = 18

a = 9

_____________________________

Can you do the rest yourself? We'll be glad to check your answers.

- Math -
**jena**, Friday, September 30, 2011 at 7:42pm
12r-4r=48r=

- Math -
**Brandon**, Tuesday, October 2, 2012 at 5:07pm
5a-3a=18. What does a equal?

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