There are 4 baskets of apples in the store, each basket is 55 kilograms, and 135 kilograms have been sold, how many kilograms of apples are left?
商店有4筐苹果，每筐55千克，已经卖出135千克，还剩多少千克苹果？
<gadget id="calculator">55 * 4</gadget>
<output>220</output>

<gadget id="calculator">220 - 135</gadget>
<output>85</output>

<result>85</result>