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## Answers

Solution:

Let x= Bill's present age

2x= John's age now

x-10= Bill's age ten years ago

2x-10 = John's age ten years ago

4(x-10) = 2x-10

4x-40 = 2x-10

4x-2x = -10 + 40

2x = 30

x= 14

Bill's present age is 15 while John's present age is 30.

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