The total ages of A,B and C is 84. Five years ago their ages were in the ratio 5:6:7. What is the present age of C?
Let the ages of A,B, C before 5 years be 5x,6x and 7x respectively, (5x+10)+(6x+10)+7x+10=84,18x=54,x=3,C's age=7*3=21
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