The number of children who visited the Science and Technology Museum that day was 4 times that of adults. A total of 450 people visited, how many children are there?
当天参观科技馆的儿童人数是成人的4倍．一共有450人参观，请问儿童有多少人？
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">450 / 5</gadget>
<output>90</output>

<result>90</result>