If a bamboo shoot doubles in height every day from germination to growth, and grows to 24dm in 8 days, how many days does it take to grow to 3dm?
一根竹笋，从发芽到长大，如果每天长高1倍，经过8天长到24dm，那么长到3dm时，经过了多少天．
<gadget id="calculator">8 - 1 - 1 - 1</gadget>
<output>5</output>

<result>5</result>