How many lilies are there in the flower shop, 18 fewer than chrysanthemums, three times as many roses as chrysanthemums, 42 fewer carnations than roses, 84 carnations, how many lilies are there in the flower shop?
花店里有若干朵百合花，比菊花少18朵，玫瑰花是菊花的3倍，康乃馨比玫瑰少42朵，康乃馨有84朵，花店里有百合花多少朵？
<gadget id="calculator">3 * 18</gadget>
<output>54</output>

<gadget id="calculator">84 - 54</gadget>
<output>30</output>

<gadget id="calculator">42 + 30</gadget>
<output>72</output>

<gadget id="calculator">72 / 3</gadget>
<output>24</output>

<result>24</result>