# RE7 | openai/gpt-5.4-mini | run 2

## Prompt

A bat and a ball cost $1.10 together. The bat costs $1.00 more than the ball. How much does the ball cost?

## Response

The ball costs **$0.05**.

If the ball costs \( x \), then the bat costs \( x + 1.00 \).  
So \( x + (x + 1.00) = 1.10 \), which gives \( 2x = 0.10 \) and \( x = 0.05 \).

Would you like a quick explanation of why many people instinctively answer $0.10?
