Number A is less than number B (1/4), what is the ratio of number A to number B? What fraction of the sum of the two numbers of A and B is the number B?
甲数比乙数少(1/4)，甲数与乙数的比是多少？乙数占甲乙两数和的几分之几？
<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">1 + (3/4)</gadget>
<output>7/4 = around 1.75</output>

<gadget id="calculator">1 / (7/4)</gadget>
<output>4/7 = around 0.571429</output>

<result>4/7 = around 0.571429</result>