Manish and Nitish are brothers. Manish is three years younger than Nitish. If Nitish age is ‘x’ then Manish’s age could be represented by the expression
x - 3
Given that Manish is three years younger than Nitish. So, Manish's age is always three years less than Nitish's age.
For example;- if Nitish’s age is 12 years, his brother’s age would be 12-3 =9 years.
So, if Nitish’s age is ‘x’, then the expression for Manish’s age would be (x-3).