The (5/8) of a number is 18 more than its (2/5), what is this number?
一个数的(5/8)比它的(2/5)多18，这个数是多少？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

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

<gadget id="calculator">(5/8) - (2/5)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">18 / (9/40)</gadget>
<output>80</output>

<result>80</result>