There are 27 black swans, and the number of white swans is 5 times less than that of black swans. How many white swans are there?
黑天鹅有27只，白天鹅的只数是黑天鹅的3倍少5只．白天鹅有多少只？
<gadget id="calculator">27 * 3</gadget>
<output>81</output>

<gadget id="calculator">81 - 5</gadget>
<output>76</output>

<result>76</result>