if twice the sons age in years is added to the age of his father the sum is 90. If twice the father's age in years is added to the age of son is 120. Find their ages.
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Answer:
let the age of the father be(y)
let the son age be (x)
2x+y=90------eq 1
x+2y=120------eq2
multiply eq 1 by 2
4x+2y=180----eq3
substract eq1 from eq3
3x=60
x=20 is the age of the son
put x=20 in eq 1
y= 50 is the age of the father
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