A and B are friend and their ages differ by 2 years. A's father D is twice as old as A and B is twice as old as his sister C. The age of D and C Differ by 40 years. Find the ages of A.
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A-B=2, D=2A, B=2C, D-C=40
A-2C=2^≈C=A-2/2
D-C=2A-(A-2)/2=40
4A-A+2=80
3A=78
A=26
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