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24/24+X = 15/20
480 = 15.24+15X
480= 360+15X
480-360 = 15X
120 = 15X
X = 8
CA = 24 + X
CA = 24+ 8
CA = 32
4. RS / RP = ST / PQ
3/7 = X/14
42 = 7x
x = 6