Question

a/3=b/4=c/7 value of a+b+c/2

Answer 1

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From a/3 = c/7 we find c = 7a/3, and from a/3 = b/4 we find b = 4a/3. 
Now (a + b + c)/c = (a + 4a/3 + 7a/3)/(7a/3) = (3 + 4 + 7)/7 = 2.

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