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b. = 250/50 : 300/50 = 5 : 6
c. = 840/4 : 5000/4 = 21 : 125
d. = 34/12 : 36/12 = 2 : 3
e. = 3200/8 : 560/8 = 40/10 : 70/10 = 4:7