Question

Amit and his sister age are in the ratio 5:4 if amit age is 45 what is his sister age

Answer 1

It is 36.
5:4 = 45:x
5x = 45*4
X = 45*4/5
X = 36

Answer 2

Given ratio of their ages is=5:4
Amit age=45
Let the age of her sister be x
=>5/4=45/x
hence x=36
Age of his sister is 36