A can of concentrated orange juice, if water is added at a ratio of 1:4, it can be made into 60 cups of drinks; if water is added at a ratio of 1:5, how many more cups of drinks can be made.
一罐浓缩橙汁，如果按1：4的比例加水，可以配成60杯饮料；如果按1：5的比例加水，可以多配多少杯饮料．
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + 5</gadget>
<output>6</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/5) / (1/6)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">60 * (6/5)</gadget>
<output>72</output>

<gadget id="calculator">72 - 60</gadget>
<output>12</output>

<result>12</result>