The food group shipped back 1,600 kilograms of flour. After using some, there were 650 kilograms left. How many kilograms of flour were used?
伙食团运回1600千克面粉，用了一些后，还剩650千克，用了多少千克面粉？
<gadget id="calculator">1_600 - 650</gadget>
<output>950</output>

<result>950</result>