Delia's money --- d
Sarah's money --- s
d+s = 225
(7/10)d = (1/5)s
7d/10 = s/5
35d = 10s
d = 10s/35
sub into d+s = 225
10s/35 + s = 225
10s + 35s = 7875
s = 175
then d = 225-175 = 50
Deliah has $50 and Sarah has $175
check: (7/1)(50) = 35
(1/5) of 175 = 35
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