Question

If a : (b + C) = 1:3 and c: (a + b) = 5: 7, find the value of b :(c + a).

• A. 1 : 2
• B. 3 : 4
• C. 4 : 5
• D. 3 : 5

Answer 1

Answer:

A. 1 : 2

a : (b + c) = 1 : 3 ---(1), c : (a + b) = 5 : 7 ---(2) Multiply by 3 in equation (1) a: (b + c) = 3 : 9 ---(3) From equation (2) and equation (3) c = 5 and a = 3 a + b = 7 b = 7 - 3 = 4 Now, b : (c + a) 4 : (5 + 3) 1 : 2