Father and daughter

When I was 11 my father was 35 year old. Now, father has three times older then me. How old is she?

Correct answer:

y =  12

Step-by-step explanation:

35+x = 3•y
y = 11+x

x-3y = -35
x-y = -11

x = 1
y = 12

Our linear equations calculator calculates it.

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