Posted by Tiffany on Tuesday, July 6, 2010 at 1:41pm.
Cross multiply and you get 30x=600. 600/30 will give you your answer.
divide top and bottom of left by 2
4/15 = x/75
multiply both sides by 5
4/3 = x/15
then multiply both sides by 3
4 =x/5
now that it is manageable, multiply both sides by 5
20 = x
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