A number minus 18 is multiplied by 5, and the product is 60. Find this number.
一个数减去18的差，再乘5，积是60，求这个数．
<gadget id="calculator">18 * 5</gadget>
<output>90</output>

<gadget id="calculator">90 + 60</gadget>
<output>150</output>

<gadget id="calculator">150 / 5</gadget>
<output>30</output>

<result>30</result>