shopping mall buys three kinds of balls: basketball, volleyball and football. Basketballs account for (1/5), volleyballs account for (2/3), and footballs account for 8. How many balls are there in total?
某商场购进篮球、排球和足球三种球．篮球占(1/5)，排球占(2/3)，足球有8只．三种球共有多少只．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(1/5) + (2/3)</gadget>
<output>13/15 = around 0.866667</output>

<gadget id="calculator">1 - (13/15)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">8 / (2/15)</gadget>
<output>60</output>

<result>60</result>