Father and son

When I was 11, my father was 35 years old. Today, my father has three times more years than me. How old is she?

Correct result:

j =  12
o =  36

Solution:


o = 3 j
o-j = 35 - 11

o = 3•j
o-j = 35 - 11

3j-o = 0
j-o = -24

j = 12
o = 36

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