A street vendor sells two type of newspapers, one for $0.25 and the other for $0.40. If she sold 100 newspapers for $28.00. How many newspaper did she sell at $0.25?

Explanation

To solve the problem step by step, we will set up a system of linear equations based on the information provided.

### Step 1: Define Variables
Let:
- \( a \) = number of newspapers sold at $0.25
- \( b \) = number of newspapers sold at $0.40

### Step 2: Set Up the Equations
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