The brain weight of a 3-year-old child is about 1000 grams, which is 5/7 of the adult brain weight. How many grams does the adult brain weigh? (Draw diagrams first, then answer)
3岁儿童的脑重约1000克，是成人脑重的(5/7)，成人脑重约多少克？(先画图分析，再解答)
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">1_000 / (5/7)</gadget>
<output>1_400</output>

<result>1_400</result>