Last year, we harvested 780 kilograms of apples, and this year we harvested 850 kilograms of apples. How many kilograms more have we collected this year than last year?
去年收了780千克的苹果，今年收了850千克的苹果，今年比去年多收了多少千克？
<gadget id="calculator">850 - 780</gadget>
<output>70</output>

<result>70</result>