My father and mother took Xiaoming to Dalian Sun Asia Ocean World on May 1st. The ticket cost 420 yuan. It is known that the adult ticket price is three times that of the child ticket price. How much is a child ticket price?
五一爸爸、妈妈带着小明去大连圣亚海洋世界玩，买门票花了420元，已知成人票价是儿童票价的3倍，一张儿童票价多少元？
<gadget id="calculator">3 + 3 + 1</gadget>
<output>7</output>

<gadget id="calculator">420 / 7</gadget>
<output>60</output>

<result>60</result>