The sum of A and B is 130, (2/5) of A is equal to (1/4) of B, and how much less is A than B.
甲乙两数的和是130，甲数的(2/5)等于乙数的(1/4)，甲数比乙数少多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * 130</gadget>
<output>65/2 = around 32.5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) + (1/4)</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">(65/2) / (13/20)</gadget>
<output>50</output>

<gadget id="calculator">130 - 50 - 50</gadget>
<output>30</output>

<result>30</result>