The total weight of three apples and one pineapple is 1800 grams, and the total weight of five apples and one pineapple is 2000 grams. How many kilograms does an apple weigh?
三个苹果一个菠萝共重1800克，5个苹果和一个菠萝共重2000克．一个苹果重多少千克？
<gadget id="calculator">2_000 - 1_800</gadget>
<output>200</output>

<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">200 / 2 / 1_000</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>