Mr. Adams is 33 and Mr. Spicer is 27. How many years ago was Mr. Adams twice as old as Mr. Spicer ?
We can set up an equation, where x = the number of years ago.
33 - x = 2(27-x) <-- When is 33 - x (Mr. Adam's age) equal to 2 times 27 - x (Mr. Spicer's age)
33 - x = 54 - 2x <-- Distribute the 2
x = 21 <-- combine like terms
Now, check it.
33 - 21 = 12
2*(27-21) = 2(6) = 12
12 years ago, Mr. Adams was twice as old as Mr. Spicer.
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