Mrs. Jameson's bamboo in the backyard grows up to 30 inches a day. Today, its height is 20 feet. In how many days will its height be 600 inches?
Since 1 foot is equal to 12 inches, then 20 feet is equal to 20 x 12 = 
<gadget id="calculator">20*12</gadget>
<output>240</output>
240 inches.
So, the bamboo needs to grow 600 - 240 = 
<gadget id="calculator">600-240</gadget>
<output>360</output>
360 inches more.
Therefore, it will take 360/30 = 
<gadget id="calculator">360/30</gadget>
<output>12</output>
12 days for its height to be 600 inches.

<result>12</result>