# math

posted by .

What type of math is this?
25% of what is 30?
and
solve for a: ab=b=3a-d

• math -

Your first problem is a percentage problem. 25% = 0.25
0.25 * 30 = 7.5

• math -

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

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

• math -

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.

• math -

correction
ab+b=3a-d

• math -

25% of what is 30
0.25x = 30
x = 30/0.25
x = 120

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