The number of A is 100, the number of A is less than the number of B (1/4), what is the number of B?
甲数是100，甲数比乙数少(1/4)，乙数是多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">100 / (3/4)</gadget>
<output>400/3 = around 133.333333</output>

<result>400/3 = around 133.333333</result>