math
posted by paul .
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?

mary's cds  x
joel has  2x
blake ( 2x7)/3
(2x7)/3 = 25
2x7 = 75
2x=82
x = 41
mary has 41
joel has 82
blake has 25