75% of a number is 15 more than 40% of 60. Find this number.
一个数的75%比60的40%多15，求这个数．
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">60 * (2/5)</gadget>
<output>24</output>

<gadget id="calculator">24 + 15</gadget>
<output>39</output>

<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">39 / (3/4)</gadget>
<output>52</output>

<result>52</result>