In a sports goods supermarket, the sales ratio of basketballs, volleyballs and footballs in the third quarter is 4:3:1. A total of 128 of these three types of balls were sold. How many basketballs were sold?
一家体育用品超市，第三季度销售篮球、排球和足球数量的比是4：3：1．这三种球一共售出128个，篮球售出了多少个？
<gadget id="calculator">4 + 3 + 1</gadget>
<output>8</output>

<gadget id="calculator">4 / 8</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">128 * (1/2)</gadget>
<output>64</output>

<result>64</result>