The difference between 5 times of a number and its 3.6 times is 5.6, find this number.
一个数的5倍与它的3.6倍相差5.6，求这个数．
<gadget id="calculator">5 - 3.6</gadget>
<output>1.4</output>

<gadget id="calculator">5.6 / 1.4</gadget>
<output>4</output>

<result>4</result>