SOLUTION: In 1 year's time, Mrs Farmer will be twice as old as she was 10 years ago. How old is she?
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Question 376239: In 1 year's time, Mrs Farmer will be twice as old as she was 10 years ago. How old is she?
Answer by nyc_function(2741) (Show Source): You can put this solution on YOUR website!
age now = x
age future = x + 1
age past = x - 10
equation: x + 1 = 2(x - 10)
x + 1 = 2(x - 10)
x + 1 = 2x - 20
x - 2x = -1 - 20
-x = -21
x = -21/-1
x = 21
She is 21 years old.
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