B-->1 foot = 12 inches. 3*12 = 36. 16 + 36 means that b=52
C-->1 yard = 3 feet. 3 yard = 9 feet. 9*12 = 108 inches. 108 - 5 means that c=103
D-->3yard = 9 feet. 6 + 9 means that d=15
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