In the "Water Saving" activity in the community, Lingling's household water was 645 kilograms, saving 283 kilograms compared with last month. How many kilograms of water did Lingling's family use last month?
在小区"节约用水"活动中，玲玲家用水645千克，比上个月节约了283千克．玲玲家上个月用水多少千克？
<gadget id="calculator">645 - 283</gadget>
<output>362</output>

<result>362</result>