The number of A is 30, which is less than the number of B (1/10), what is the number of B?
甲数是30，比乙数少(1/10)，乙数是多少．
<gadget id="calculator">1 / 10</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">30 / (9/10)</gadget>
<output>100/3 = around 33.333333</output>

<result>100/3 = around 33.333333</result>