30% of a number is 24, what is 90% of this number?
一个数的30%是24，这个数的90%是多少．
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">24 / (3/10)</gadget>
<output>80</output>

<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">80 * (9/10)</gadget>
<output>72</output>

<result>72</result>