Father and son

Father is three times older than his son. 12 years ago father was nine times older than the son. How old are father and son?

Result

x =  48
y =  16

Solution:

x = 3y
x-12 = 9(y-12)

x-3y = 0
x-9y = -96

x = 48
y = 16

Calculated by our linear equations calculator.

Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...): Math student
when I was 11 my father was 35 year old. Now, father has three times older then me. How old is she? pls solution the problem  To solve this example are needed these knowledge from mathematics:

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