A factory plans to burn 36 tons of coal this month, but it burnt in the first half of the month (3/8). If the second half of the month burns the same amount as the first half, how many tons of coal will it burn less than planned this month?
某厂计划本月烧煤36吨，上半月烧了(3/8)，如果下半月烧的和上半月一样多，本月将比计划少烧煤多少吨？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(3/8) + (3/8)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">36 * (1/4)</gadget>
<output>9</output>

<result>9</result>