Question

1. a customer purchases a 30 foot long piece of pipe. the pipe was originally 40 foot long. how many inches of pipe remains unsold?

Explanation:

<pre_analysis>
{
"quality": "clear",
"question_count": 1,
"skills_matched": [
"step_cot",
"blank_filling_formatter",
"explain_then_answer",
"quick"
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"concepts_used": [],
"new_concepts": [
"Unit Conversion",
"Linear Measurement"
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"current_concepts": [
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</pre_analysis>

<reasoning>

Calculate the length of unsold pipe in feet

\[
L_{\text{unsold}} = 40\text{ ft} - 30\text{ ft} = 10\text{ ft}
\]

Convert the remaining length from feet to inches

\[
10\text{ ft} \times 12\text{ inches/ft} = 120\text{ inches}
\]
</reasoning>

<answer>

1. A customer purchases a 30 foot long piece of pipe. The pipe was originally 40 foot long. How many inches of pipe remains unsold? <blank>120</blank>

</answer>

<post_analysis>
{
"subject": "Mathematics",
"question_type": "Fill-in-the-blank",
"knowledge_point": [
"Mathematics",
"Arithmetic",
"Unit Conversion"
]
}
</post_analysis>

Answer:

<pre_analysis>
{
"quality": "clear",
"question_count": 1,
"skills_matched": [
"step_cot",
"blank_filling_formatter",
"explain_then_answer",
"quick"
],
"needs_drawing": false,
"concepts_used": [],
"new_concepts": [
"Unit Conversion",
"Linear Measurement"
],
"current_concepts": [
"Unit Conversion",
"Linear Measurement"
]
}
</pre_analysis>

<reasoning>

Calculate the length of unsold pipe in feet

\[
L_{\text{unsold}} = 40\text{ ft} - 30\text{ ft} = 10\text{ ft}
\]

Convert the remaining length from feet to inches

\[
10\text{ ft} \times 12\text{ inches/ft} = 120\text{ inches}
\]
</reasoning>

<answer>

1. A customer purchases a 30 foot long piece of pipe. The pipe was originally 40 foot long. How many inches of pipe remains unsold? <blank>120</blank>

</answer>

<post_analysis>
{
"subject": "Mathematics",
"question_type": "Fill-in-the-blank",
"knowledge_point": [
"Mathematics",
"Arithmetic",
"Unit Conversion"
]
}
</post_analysis>