Question
The sum of three numbers is 189. If the ratio of the
first to the second is 3:4 and that of second to the third is 5:7 then the second number is?Solution
Let the three numbers be A, B and C. Now, A:B = 3:4 & B:C = 5:7 A: B: C = 15:20:28 A+B+C = 189 15k + 20k + 28k = 189 63k = 189 k = 3 Second number = B = 20 x 3 = 60
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