The fruit shop shipped 170 baskets of apples, each weighing 45 kilograms. After some of them were sold, there were 80 baskets left. How many kilograms of apples were sold?
水果店运来170筐苹果，每筐45千克，售出一部分后，还剩80筐，卖出多少千克苹果？
<gadget id="calculator">170 - 80</gadget>
<output>90</output>

<gadget id="calculator">45 * 90</gadget>
<output>4_050</output>

<result>4_050</result>