First subtract 3 from a number, and then multiply the difference by 10 times to get 5.4. What is the number?
一个数先减去3，再将差扩大10倍得5.4，这个数是多少．
<gadget id="calculator">5.4 / 10</gadget>
<output>0.54</output>

<gadget id="calculator">0.54 + 3</gadget>
<output>3.54</output>

<result>3.54</result>