There are 420 computers in Yihua Computer City. They were sold on the first day (1/4), and on the second day (4/15). How many computers were sold on the second day?
益华电脑城有电脑420台，第一天卖出(1/4)，第二天卖出第一天的(4/15)，第二天卖出电脑多少台？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">4 / 15</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">420 * (1/4) * (4/15)</gadget>
<output>28</output>

<result>28</result>