Question

grand father is 8 times as old as his grandson also he is 63 years older than him find their present age

Answer 1

let his grandson age be x
it is given that he granfather is of 63 and 8 times his grandsons age
then
8x=63
x=7.875 years old

Answer 2

x=8 y
X= y+63

8y=y+63
Y=9

X=72 years