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Dan is twice as old as Bob. The sum of their ages seven years ago was 13. How old are they now

Solution

Dan is twice as old as Bob. The sum of their ages seven years ago was 13. How old are they now

Solution

Bob^{'} s age is : 9

Dan^{'} s age is : 18

Solution steps

Translate the problem into an equation:

2 x - 7 + x - 7 = 13

Solve for

x, 2 x - 7 + x - 7 = 13 : x = 9

Find age

Bob^{'} s age is : 9

Dan^{'} s age is : 18

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