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### Math Puzzles & Brain Teasers

Old Enough ?

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 Hide all answers   View all answers   Print   Try the Quiz Graham: "When I add 6 times my age 6 years from now to 7 times my age 7 years from now, I get 14 times my current age. How old will I be 3 years from now?" Answer: 88 Solution: "Let x be my present age. My age 6 years from now will be x + 6, and 6 times that will be 6 (x + 6). Similarly, my age 7 years from now will be x + 7, and 7 times that will be 7 (x + 7). Adding the two gives 14 times my current age. This gives the equation: 6 (x + 6) + 7 (x + 7) = 14 x. Solving the above equation gives x = (6 × 6) + (7 × 7) = 85. Thus, I will be 88 years old 3 years from now." Food for thought: How do you verify the answer? It's easy! By substitution, right?   Try the Quiz :     Puzzles & Brain Teasers : Old Enough ?