The fruit shop shipped 200 kilograms of lychees and sold 2 baskets, each basket a kilogram, how many kilograms are left. (indicated by a formula containing letters)
水果店运来200千克荔枝，卖出2筐，每筐a千克，还剩多少千克．(用含字母的式子表示)
<gadget id="calculator">200 - 2</gadget>
<output>198</output>

<result>198</result>