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John is 3 times as old as Mark. Three years ago, John was four times as old as Mark. The sum of their ages is?
in Math by engr III (10.4k points) | 23 views

1 Answer

+1 vote
3x - 3 = 4 (x-3)

x = 9

3 ( 9) = 27

9 + 27 = 36
by cadet engr (339 points)
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