On "Mother's Day", the flower shop bought 280 carnations, and the number of lilies purchased was twice that of carnations. How many two kinds of flowers did you buy in total?
"母亲节"那天，鲜花店进购了280朵康乃馨，进购的百合是康乃馨的2倍．两种花一共进购了多少朵？
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">280 * 3</gadget>
<output>840</output>

<result>840</result>