There are 7 white swans, and 3 black swans are 8 times the number of white swans, how many black swans are there?
有白天鹅7只，黑天鹅是白天鹅的8倍多3只，黑天鹅有多少只．
<gadget id="calculator">7 * 8</gadget>
<output>56</output>

<gadget id="calculator">56 + 3</gadget>
<output>59</output>

<result>59</result>