Three friends their sum of age is 80 wht will be three years ago?
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X+Z+Y=80
let X,y,Z be the age of three friends
after 3 years,
X+3
Z+3
Y+3
X+Y+Z+9=80+3
X+Y+Z=83-9
X+Y+Z=74
so with this make possible pairs
let X,y,Z be the age of three friends
after 3 years,
X+3
Z+3
Y+3
X+Y+Z+9=80+3
X+Y+Z=83-9
X+Y+Z=74
so with this make possible pairs
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