The weight of a pear is equal to the weight of 2 apples, and the weight of 2 pears is equal to the weight of a pineapple. It is known that an apple weighs 100 grams, so how many grams does a pineapple weigh?
一个梨的重量等于2个苹果的重量，2个梨的重量等于一个菠萝的重量，已知一个苹果重100克，那么一个菠萝重多少克？
<gadget id="calculator">100 * 2</gadget>
<output>200</output>

<gadget id="calculator">200 * 2</gadget>
<output>400</output>

<result>400</result>