There are 72 tons of cement in a batch, and (5/9) is used up. How many tons of cement are used?
一批水泥有72吨，用去了(5/9)，用去水泥多少吨？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">72 * (5/9)</gadget>
<output>40</output>

<result>40</result>