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 answer:

j =  12
o =  36

Step-by-step explanation:


o = 3 j
o-j = 35 - 11

o = 3·j
o-j = 35 - 11

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

Row 2 - 1/3 · Row 1 → Row 2
3j-o = 0
-0.67o = -24


o = -24/-0.66666667 = 36
j = 0+o/3 = 0+36/3 = 12

j = 12
o = 36

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