A pot of cooking oil weighs exactly 1 kilogram, and the weight of the pot is known to be 160 grams. What is the net weight of this pot of oil in grams?
一壶食油，连壶称正好1千克，已知壶重160克，这壶油的净含量是多少克？
<gadget id="calculator">1 * 1_000</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 - 160</gadget>
<output>840</output>

<result>840</result>