There is a kind of aquatic plant that doubles every day, and grows to 32 square meters in 3 days, so how many days does it grow to 64 square meters.
有一种水草每天长一倍，到3天时长到32平方米，那么第多少天天时长到64平方米．
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<result>4</result>