Daxing Supermarket shipped 60 boxes of salad oil, each with 25 bottles, weighing 4 tons and 500 kilograms in total. How many kilograms does each bottle of salad oil weigh?
大兴超市运来60箱色拉油，每箱25瓶，共重4吨500千克，每瓶色拉油重多少千克？
<gadget id="calculator">60 * 25</gadget>
<output>1_500</output>

<gadget id="calculator">4_500 / 1_500</gadget>
<output>3</output>

<result>3</result>