If the present age of a grandfather is 72 years while his grandson's age is 12 years then find the ratio of their age after 8 years.
4:1
The present age of grandfather is 72 years and his grandson is 12 years.
After 8 years,the age of :
grandfather = 72 + 8 =80 years
his grandson = 12 + 8 = 20 years
So, the ratio of their respective ages would be 8020=41=4:1