Xiao Ming surveyed the Olympic ball games that 50 students in the class like to watch the most. The students who like to watch table tennis account for the whole class (2/5), which is more than the number of people who like badminton (1/3). How many people are there in the class? Like to watch badminton?
小明调查班上50名同学最喜欢看的奥运球类比赛情况，喜欢看乒乓球的同学占全班的(2/5)，比喜欢羽毛球的人数多(1/3)，班上有多少人喜欢看羽毛球？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">(2/5) / (4/3)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">50 * (3/10)</gadget>
<output>15</output>

<result>15</result>