List comprehensive formulas or equations to solve problems: (1/2) of a number is 20 more than 25% of this number, what is this number?
列综合算式或方程解题：一个数的(1/2)比这个数的25%多20，这个数是多少？
<gadget id="calculator">20 / 0.25</gadget>
<output>80</output>

<result>80</result>