60% of a certain number minus (1/3) of this number is exactly 6.4. What is this number?
某数的60%减去这个数的(1/3)，恰好是6.4．这个数是多少？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

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

<gadget id="calculator">(3/5) - (1/3)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">6.4 / (4/15)</gadget>
<output>24</output>

<result>24</result>