Alex is thrice as old as David. Four years ago, he was 4 times as old as David. How old are they now?
Alex= A
David= D
1. 3d - 4 = 4(d - 4)
2. 3d - 4 = 4d - 16
3. 3d - 4d = -16 + 4
4. -d = 12
5. d = 12
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Alex is thrice as old as David. Four years ago, he was 4 times as old as David. How old are they now?
Alex= A
David= D
1. 3d - 4 = 4(d - 4)
2. 3d - 4 = 4d - 16
3. 3d - 4d = -16 + 4
4. -d = 12
5. d = 12
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