Question

The ratio of two numbers 'a' and 'b' is 7:4, respectively. Whereas the ratio of 'b' and 'c' is 5:8, respectively. When 15 is added to 'a', it becomes thrice of 'b'. Find the sum of 'a', 'b' and 'c'.

A 55.66
B 52.2
C 65.5
D 75.2
E None of these
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