The number A is 40, which is 10 more than 30% of the number B. Find the number B.
甲数是40，比乙数的30%还多10，求乙数．
<gadget id="calculator">40 - 10</gadget>
<output>30</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">30 / (3/10)</gadget>
<output>100</output>

<result>100</result>