180 (4/9) is 20 less than 50% of a number. Find this number.
180的(4/9)比一个数的50%少20，求这个数．
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">180 * (4/9)</gadget>
<output>80</output>

<gadget id="calculator">80 + 20</gadget>
<output>100</output>

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

<gadget id="calculator">100 / (1/2)</gadget>
<output>200</output>

<result>200</result>