Question

grandfathers age is 4 times abduls age. 10 years ago his age was 7 times abduls age. find their present ages

Answer 1

20,80

Explanation:

`Let\ Abduls\ present\ age\ be\ x\\His\ Grandfather's\ present\ age\ = 4x\\\\Abdul's\ age\ before\ 10\ years=x-10\\His\ Grandfather's\ age\ before\ 10\ years =4x-10\\\\We\ are\ given\ that\ ,\\Abdul's\ Grandfather's\ age\ before\ 10\ years = 7 * Abdul's\ age\ before\ 10\ years\\Hence, \\4x-10=7(x-10)\\4x-10=7x-70\\-10+70=7x-4x\\60=3x\\x=20\\Hence,\\Abduls\ present\ age\ =20\\His\ grandfather's\ present\ age\ = 4*20=80`

Answer 2

Abdul's age=20 y/o

Grandpa's age=80y/o

Explanation:

let Abdul's age be 'x'

so, grandpa's age=4x

Grandpa's age 10 yrs ago= 4x-10

according to the question, grandpa's age 1o yrs ago=7(x-10)

so, 4x-10=7(x-10)

4x-10=7x-70

by substituting,

70-10=7x-3x

60=3x

60/3=x

20y/o=x

so, 4x=20*4=80 y/o