If the sum of present ages of A,B and C is 50 years.Before 5 years the ratio of their ages was 1: 2 : 4. Present age of B is - A, B और C की वर्तमान आयु का योग 50 वर्ष है। यदि 5 वर्ष पहले उनकी आयु का अनुपात 1 : 2 : 4 था तो B की वर्तमान आयु क्या है?

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