75% of a number is 20 more than (1/2) of this number, what is this number? (solution by equation)
一个数的75%比这个数的(1/2)多20，这个数是多少？(用方程解)
<gadget id="calculator">0.75 - 0.5</gadget>
<output>0.25</output>

<gadget id="calculator">20 / 0.25</gadget>
<output>80</output>

<result>80</result>