The first photo shoot takes 3 minutes long and then the following shoots are taken at a rate of 21 seconds/shoot as the model is already at the scene. What is the maximum number of photo shoots taken in 10 minutes ?  Choose the correct choice:
A) 13  B) 14  C) 15  D) 16  E) 21
a must be an integer as it is the number shoots at a rate of 21sec/shoot   3*60 + 21a = 10*60   21a = 420   a = 20   The total number of shoots --&gt;1 +20 = 21 and   22th shoot will be taken at 621 seconds which is above 10 minutes   ANSW21R: 21-- 1 +20= 
<gadget id="calculator">-- 1 +20</gadget>
<output>21</output>
21 and   22th shoot will be taken at 621 seconds which is above 10 minutes   ANSW21R: 21
<result>E</result>
The first photo shoot takes 3 minutes long and then the following shoots are taken at a rate of 21 seconds/shoot as the model is already at the scene. What is the maximum number of photo shoots taken in 10 minutes ?