Dad bought back 4,000 grams of soybean oil. After eating 1,000 grams, he bought back 3,000 grams of vegetable oil. How many kilograms of oil are there?
爸爸买回4000克豆油，吃掉1000克后，又买回3000克菜油，还有油多少千克？
<gadget id="calculator">4_000 - 1_000</gadget>
<output>3_000</output>

<gadget id="calculator">3_000 + 3_000</gadget>
<output>6_000</output>

<gadget id="calculator">6_000 / 1_000</gadget>
<output>6</output>

<result>6</result>