If (1/4) of a number is 100, what is the number that is 50% greater than this number?
一个数的(1/4)是100，比这个数多50%的数是多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">100 / (1/4)</gadget>
<output>400</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">400 * (3/2)</gadget>
<output>600</output>

<result>600</result>