Posted by Anonymous on Wednesday, March 2, 2011 at 10:23pm.
Use ratios
4 : 7 : 7-4=3
X : Y : 15"
Cross multiply with X:
X=4*15/3=20
Cross multiply with Y:
Y=7*15/3=35
Check: Y-X=15, Y/7=X/4=5 OK
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