18. The ratio of 1 to 8 to 2 is equal to the ratio of A) 9 to 1 C) 9 to 20 B) 9 to 10 D) 18 to 100
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To find a : b : c, b is made same in both the ratios. L.C.M of 4 and 5 is 20
a:b=43=4×53×5=2015
b:c=95=9×45×4=3620
∴ a:b:c=15:20:36
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