If the average (arithmetic mean) of the four numbers K, 3K + 3, 3K – 4 and 5K + 1 is 60, what is the value of K?	Choose the correct choice from the following:	A) 11	B) 15 3/4	C) 20	D) 23	E) 25 3/10
K + 3K +3 + 3K - 4 + 5K +1 = 12K   (12K)/4 = 60   12K = 60 * 4= 
<gadget id="calculator">60 * 4</gadget>
<output>240</output>
240   K= 240/ 12= 
<gadget id="calculator">240/ 12</gadget>
<output>20</output>
20.   Answer 20.
<result>C</result>
If the average (arithmetic mean) of the four numbers K, 3K + 3, 3K – 4 and 5K + 1 is 60, what is the value of K?