(2/5) of a number is 4 more than its (1/3), find this number.
一个数的(2/5)比它的(1/3)多4，求这个数．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(2/5) - (1/3)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">4 / (1/15)</gadget>
<output>60</output>

<result>60</result>