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Let grandfather's age be x and abdul's age be y.
equation 1
x=4y
x-4y=0
ten years ago:
grandfather's age = x-10
abdul's age = y-10
equation 2
x-10=7 (y-10)
x-10=7y-70
x-7y= -70+10
x-7y= -60
x- 4y = 0
x- 7y = -60 (substraction)
- + +
3y = 60
y = 20
substitute:
x-4y=0
x=4×20
x=80
anwer: Grandfather's age: 80 years.
Abdul's age: 20 years.
equation 1
x=4y
x-4y=0
ten years ago:
grandfather's age = x-10
abdul's age = y-10
equation 2
x-10=7 (y-10)
x-10=7y-70
x-7y= -70+10
x-7y= -60
x- 4y = 0
x- 7y = -60 (substraction)
- + +
3y = 60
y = 20
substitute:
x-4y=0
x=4×20
x=80
anwer: Grandfather's age: 80 years.
Abdul's age: 20 years.
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