There are 60 students in the whole class, (2/3) like to play football, (3/4) like to play basketball, (4/5) like to play badminton, at least how many people like all three?
全班有60个同学，喜欢踢足球的有(2/3)，喜欢篮球的有(3/4)，喜欢羽毛球的有(4/5)，问三项都喜欢至少有多少人？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">60 * (1/3)</gadget>
<output>20</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">60 * (1/5)</gadget>
<output>12</output>

<gadget id="calculator">60 - 20 - 15 - 12</gadget>
<output>13</output>

<result>13</result>