Problema Solution
nono is five years older than his sisters. the sum of the ages of the twins three years ago is equal to his age five years from now. how old will they be 12 years from now?
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let
n = the present age of nono
s = the age of each of his sisters
nono is five years older than his sisters:
n = 5 + s
the sum of the ages of the twins three years ago is equal to his age five years from now:
2s - 2*3 = 5 + n
by solving the system of equations:
n = 5 + s
2s - 2*3 = 5 + n
we find:
n = 21 years
s = 16 years
click here to see the step by step solution of the system of equations:
in 12 years they will be:
21 + 12 = 33
nono will be 33 years old
16 + 12 = 28
each of his sisters will be 28 years old.