25% of a number is 150, what is 40% of this number?
一个数的25%是150，这个数的40%是多少．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">150 / (1/4)</gadget>
<output>600</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">600 * (2/5)</gadget>
<output>240</output>

<result>240</result>