A's number is 50, which is 10% less than B's number, find B's number. What is the correct column type;
甲数是50，比乙数少10%，求乙数．正确列式是多少；
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">50 / (9/10)</gadget>
<output>500/9 = around 55.555556</output>

<result>500/9 = around 55.555556</result>