SOLUTION: Four years ago henry was three times as old as alfred. Three years hence he will twice as old. Find the present age

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Question 933326: Four years ago henry was three times as old as alfred. Three years hence he will twice as old. Find the present age
Answer by Fombitz(32388) About Me  (Show Source):
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Four years ago,
H-4=3%28A-4%29
H-4=3A-12
1.H=3A-8
.
.
.
H%2B3=2%28A%2B2%29
H%2B3=2A%2B4
2.H=2A%2B1
Substituting from eq. 1,
3A-8=2A%2B1
A=9
Then,
H=3%289%29-8
H=27-8
H=19