A number increased by 15% is 4.6, what is this number?
一个数增加它的15%是4.6，这个数是多少．
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 + (3/20)</gadget>
<output>23/20 = around 1.15</output>

<gadget id="calculator">4.6 / (23/20)</gadget>
<output>4</output>

<result>4</result>