A pile of coal is 150t. After using it for a while, there are still 60t left. What fraction of the total amount is used?
一堆煤150t，用了一段时间后还剩60t，用去了总数的几分之几？
<gadget id="calculator">150 - 60</gadget>
<output>90</output>

<gadget id="calculator">90 / 150</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>