SOLUTION: Is John is 12 years younger than twice his sister's age and he is sixteen how old is his sister?

Question 1152369: Is John is 12 years younger than twice his sister's age and he is sixteen how old is his sister?
Answer by Theo(13342) (Show Source): You can put this solution on YOUR website!
j = john's age.
s = his sister's age.
j = 16
j = 2s - 12
replace j with 16 to get:
16 = 2s - 12
add 12 to both sides of the equation to get:
28 = 2s
solve for s to get:
s = 14
his sister is 14 years old.
since 16 = 2 * 14 - 12, the solution is confirmed to be good.
his sister is 14 years old is the solution.

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