The number of adults visiting the museum is three times that of children, and there are 139 children visiting the museum. How many people visit the museum in total?
参观博物馆的成人人数是儿童的3倍，参观的儿童有139人，一共有多少人参观博物馆？
<gadget id="calculator">139 * 3</gadget>
<output>417</output>

<gadget id="calculator">417 + 139</gadget>
<output>556</output>

<result>556</result>