Question 369484
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Hi,
Let x represent Fred's age now.  Then William's age now is(20-x)
Write as we Read***
(20-x) + 1 = 9(x-1)
Solving for x
20 -x + 1 = 9x -9
30 = 10x
3 = x, Fred's age now.  William is now 17 (20-3)

checking our answer
17 + 1 = 9*2