Uncle Wang and 19 colleagues went to a restaurant for lunch, and each ordered a bowl of beef noodles for 20 yuan. How much did they have to pay in total?
王叔叔和19位同事一起到餐馆吃午饭，每人点了一碗20元的牛肉面，一共要付多少元？
<gadget id="calculator">19 + 1</gadget>
<output>20</output>

<gadget id="calculator">20 * 20</gadget>
<output>400</output>

<result>400</result>