GREQuantitative Reasoning

If a, b, c are in ratio 1:2:3 and sum is 60, what is c?

A10
B20
C30CORRECT
D40
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Toaster Teacher
Why the answer is C, and why the others tempt you.
Sum of parts = 6. 60/6 = 10. c = 3 × 10 = 30.
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