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300 = 100%
66 = x%
x= (66*100)/300 = 22%
b)
40 = 100%
16 = x%
x = (16*100)/40 = 40%
c)
120 = 100%
45 = x%
x+ (45*100)/120 = 37,5%
66-x%
x=(66×100)/300=6600÷300=22%
b)56-100%
12-x%
x=(12×100)/56=1200÷56≈21,43
C)120 -100%
45-x%
x=(45×100)/120=4500÷120=37,5