Question

When i was 4 years old my sister was half my age now i am 80 years old how old is my sister?

Answer 1

Your old age=4 years
your sisters old age =4/2
=2 years
Your present age=80 years
your sister present age=80/2
=40 Years
HOPE IT HELPS

Answer 2

Hey user here is your answer.........


◆ When you were of 4 year then your sister is half of your age

So,

◆4×1/2= 2

◆It means you are of 2 years.

◆When you are of 80 your sister will be of 78 because here difference is of 2.

---------> MATHEMATICALLY

◆4-(4/2)=80-x

◆x=80-4+(4/2)

◆x= 76+4/2

◆x=(76×2)+4/2

◆x=152+4/2

◆x=156/2=78

◆So your sister will be of 78 years.


Hope it helps you☺️

#Rohan (Maths aryabhatta)