50% of a number is 20 more than (1/4) of this number. Find this number.
一个数的50%比这个数的(1/4)多20，求这个数．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 / (1/4)</gadget>
<output>80</output>

<result>80</result>