Question

grandfather is 6 times as old as his granddaughter. After 15 years he will be three times of his granddaughter age then. The present age of grand daughter is----------------
5 years
15 years
7 years
10 years
​

Answer 1

Answer:

Present age of grand daughter is 10 years old.

Step-by-step explanation:

Let, age of grand father present = x

age of grand daughter present = y

x= 6y

After 15 year age of grand father =x+15

Age of grand daughter = y+15

x+15=3×(y+15) , using x= 6y

6y+15=3y+45

=>y=10 (present age of grand daughter)