Question

Solve for a: 4a/9=100/45
A. 5
B. 25
C. -5
D. -25

Answer 1

A.
Multiply both sides by 9, divide both sides by 4.

Answer 2

\[\frac{ 4a }{ 9 } = \frac{ 100 }{ 45 }\]

cross multiply

simplify and solve for 'a'

Answer 3

I did that but I got 0.2 @johnweldon1993

Answer 4

so you multiply 4a...by 45...to get 180a

then multiply 9 by 100...to get 900

so you have

180a = 900

divide both sides by 180 to isolate 'a'

180a = 900
----------
180 180

a = 5

Answer 5

oh, right. I see what I did wrong. Thank you very much!

Answer 6

So I believe you just mixed up where the 'a' was placed...no problem :)

Answer 7

Yes. :)