Question

If a : (b + c) = 1 : 3 and c : (a + b) = 5 : 7 , then b : (c + a) is _____

Answer 1

3a – b – c = 0 …………(i)

5a + 5b – 7c = 0 …………(ii)

by (i) × 5 – (ii) × 3, we get