Question 516981
Let

Grandfather's present age = g
Granddaughter present age = d



Grand father is 10 times older than his granddaughter.

g=10d.........(1)

He is also 54 older than her
g=d+54..........(2)

Subtitute the value of g from (1) to (2)

10d=d+54
10d-d=54
9d=54
9d/9=54/9
d=6
Subtitute the value of d in (1)
g=10d
g=(10)(6)
g=60

Grandfather's present age = g = 60 years old
Granddaughter present age = d = 6 years old