Concept Used: Any mathematical idea written into a word problem can be easily expressed using numbers and symbols. It helps to understand a certain problem into an easier and meaningful way. Let us consider following examples to understand this better:

1. Suppose we have $200 to spend on bags and pens. Let each bag cost $10 and each pen cost $2.

We need to represent this problem into a mathematical expression.

Let we need to buy x bags and y pens to spend this amount. This can be expressed as:

$10x + $2y = $200

2. Let 3 times a number is equals to 52. This can be represented as:

3x=52

1. Suppose we have $200 to spend on bags and pens. Let each bag cost $10 and each pen cost $2.

We need to represent this problem into a mathematical expression.

Let we need to buy x bags and y pens to spend this amount. This can be expressed as:

$10x + $2y = $200

2. Let 3 times a number is equals to 52. This can be represented as:

3x=52