Posted by **Alex** on Sunday, January 9, 2011 at 1:23pm.

What type of math is this?

25% of what is 30?

and

solve for a: ab=b=3a-d

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**Ms. Sue**, Sunday, January 9, 2011 at 1:29pm
Your first problem is a percentage problem. 25% = 0.25

0.25 * 30 = 7.5

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**ron jon**, Sunday, January 9, 2011 at 1:30pm
your doing "is over of equals percnt over 100. so you set it up

30/x =25/100

cross multiply and solve for x

25x= 3000

dicide by 25 for your answer.

this is stuff you learn in algebra. i am confused with the second equation though

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**Alex**, Sunday, January 9, 2011 at 1:32pm
But the answer is 120. I have the answers to those questions. I just need to know topics they are included in so I can study.

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**Alex**, Sunday, January 9, 2011 at 1:33pm
correction

ab+b=3a-d

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**Ms. Sue**, Sunday, January 9, 2011 at 1:46pm
Oops, Alex, I misread your problem. I'm sorry.

25% of what is 30

0.25x = 30

x = 30/0.25

x = 120

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