Homework Help: math

Posted by paul on Sunday, November 4, 2012 at 8:38pm.

Joel has twice as many cds as Mary has. Subtracting 7 from the number of cds Joel has and dividing by 3 equals the number of cds Blake has. If Blake has 25 cds, how many cds does Mary have?

math - Reiny, Monday, November 5, 2012 at 12:50am
mary's cds --- x
joel has ------ 2x
blake ------( 2x-7)/3

(2x-7)/3 = 25
2x-7 = 75
2x=82
x = 41

mary has 41
joel has 82
blake has 25

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