The store shipped 240 kilograms of apples and sold 6 boxes of 15 kilograms each. How many kilograms are left?
商店运来240千克苹果，卖出6箱，每箱15千克，还剩多少千克？
<gadget id="calculator">15 * 6</gadget>
<output>90</output>

<gadget id="calculator">240 - 90</gadget>
<output>150</output>

<result>150</result>