First, form the expression and then triple it.

Unlike terms are those which can not be added together.

Terms added up together makes an expression.

An algebraic expression has a variable, constant and operational symbol. The difference between an expression and equation.

First get the total number of pencils left with him and then find the amount.

TrebleÂ is same as triple. So, first form the expression and then triple it.

The number of terms in an expression determines it is monomial, binomial, etc.

To make it monomial, it should have all the variables same.