2016+2016=4032-3932=100,here 100 is thier sum of thier age..let x is the age of grand son the grand father age is 4x, now x+4x=100,5x=100,x=20 grand son’s age is 20years,so his year of birth is 2016-20=1996,and grandfather’s year is 4*20=80 years so his birth year is 2016-80=1936
Bindask
2016+2016=4032-3932=100,here 100 is thier sum of thier age..let x is the age of grand son the grand father age is 4x, now x+4x=100,5x=100,x=20 grand son’s age is 20years,so his year of birth is 2016-20=1996,and grandfather’s year is 4*20=80 years so his birth year is 2016-80=1936