There are 1428 tennis balls in total, and every 5 tennis balls are packed in a tube, and there are 3 tennis balls left after filling. How many tubes are there in total?
共有1428个网球，每5个装一筒，装完后还剩3个，一共装了多少筒？
<gadget id="calculator">1_428 - 3</gadget>
<output>1_425</output>

<gadget id="calculator">1_425 / 5</gadget>
<output>285</output>

<result>285</result>