The sum of father's age and twice the age of his is 70.If we double the age of the father and add it to the age of his son the sum is 90 .find their present age.
Dhruvvala26:
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father's age is = X
son's age is=y
first condition
x+2y=70
second conditions
2x+y=90
eq.1 multiply by 2
x+2y=70. x 2
2x+ 4y=140.
sabstract equation 1 from 2
2x +4y=140.
-2x+y=90
-. -. -
___________
0+2y=50
2y=50
y=50÷2
y=25
put y= 25 in equation 1
x+2y=70
x+2(25)=70
x+50=70
x=70-50
x=30
son's age is=y
first condition
x+2y=70
second conditions
2x+y=90
eq.1 multiply by 2
x+2y=70. x 2
2x+ 4y=140.
sabstract equation 1 from 2
2x +4y=140.
-2x+y=90
-. -. -
___________
0+2y=50
2y=50
y=50÷2
y=25
put y= 25 in equation 1
x+2y=70
x+2(25)=70
x+50=70
x=70-50
x=30
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