Question

20/15-x=5/x how do i solve this?

Answer 1

is 15 - x in the denominator or just the 15?

Answer 2

yes

Answer 3

the 15-x is the denominator

Answer 4

20 5
------ = ----
15 - x x

Anytime you have a fraction = a fraction, you can cross multiply.

20(x) = 5(15 - x) distribute
20x = 75 - 5x add 5x to both sides
25x = 75 divide by 25
x = 3

Answer 5

thanks! will you help me out some more?

Answer 6

Sure

Answer 7

140-x/81=x/9

Answer 8

140 - x x
------- = ---
81 9

Because you have a fraction = a fraction - you cross multiply.

Answer 9

(140 - x) * 9 = 81 * x

Answer 10

now distribute

Answer 11

1260 - 9x = 81x

Answer 12

Add 9x to both sides

Answer 13

1260 = 90x

Answer 14

Divide both sides by 90

Answer 15

14 = x

Answer 16

thanks i get it now its a lot easier explained step by step like that you are a lot of help..