Question

If a : b = 3 : 5 and b : c = 4 : 7, find a : b : c.​

Answer 1

Answer:

a:b:c:= 12:20:35.(ans)

Answer 2

We make b, the same in both the ratios.

L.C.M. of 5 and 4 = 20.

So, we make b equal to 20 in each case.

Now, a : b = 3 : 5 = 3/5 = 3 × 4/5 × 4 = 12/20 = 12 : 20.

b : c = 4 : 7 = 4 × 5/7 × 5 = 20 : 35.

Therefore, a : b : c = 12 : 20 : 35.