The Guangming Steel Plant shipped in a batch of coal, originally planned to burn 3 tons per day, which could last for 90 days. Due to the adoption of new coal-saving technology, the actual amount of coal burned per day is equivalent to (3/4) of the original plan. How many days can this batch of coal actually be burned?
光明炼钢厂运进一批煤，原计划每天烧3吨，可以烧90天．由于采用了新的节煤技术，实际每天烧煤量相当于原计划的(3/4)．这批煤实际可以烧多少天？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3 * (3/4)</gadget>
<output>9/4 = around 2.25</output>

<gadget id="calculator">90 / (9/4)</gadget>
<output>40</output>

<gadget id="calculator">3 * 40</gadget>
<output>120</output>

<result>120</result>