There are 960 kilograms of lychees in the supermarket, and 18 baskets of 25 kilograms each have been sold. How many kilograms are left?
超市有960千克荔枝，已经卖出了18筐，每筐25千克．还剩多少千克？
<gadget id="calculator">25 * 18</gadget>
<output>450</output>

<gadget id="calculator">960 - 450</gadget>
<output>510</output>

<result>510</result>