SOLUTION: Don is 21 years older than Betty. In 6 years Don will be twice as old as Betty. How old are they now?

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Question 359900: Don is 21 years older than Betty. In 6 years Don will be twice as old as Betty. How old are they now?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
D = B+21.
D+6 = 2(B+6).
By direct substitution, B+21+6= 2(B+6).
B+27 = 2B+12.
B = 15.
D = 36.