SOLUTION: Mary is twice the sum of Sally's age and 2 years. If Mary is 12, how old is Sally?

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Question 1094628: Mary is twice the sum of Sally's age and 2 years. If Mary is 12, how old is Sally?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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Mary is twice the sum of Sally's age and 2 years.
m = 2s + 2
If Mary is 12, how old is Sally?
12 = 2s + 2
12 - 2 = 2s
10 = 2s
s = 10/2
s = 5 yrs is Sally's age