If the average (arithmetic mean) of the four numbers K, 2K + 3, 3K – 5 and 5K + 1 is 30, what is the value of K?  Choose the correct choice.
A) 11
B) 15 3/4
C) 22
D) 23
E) 25 3/10
K + 2K +3 + 3K - 5 + 5K +1 = 11K -1   (11K -1)/4 = 30   11K = 30 * 4 +1 = 120 +1= 
<gadget id="calculator">120 +1</gadget>
<output>121</output>
121   K= 121 / 11= 
<gadget id="calculator">121 / 11</gadget>
<output>11</output>
11.   11nswer 11.
<result>A</result>
If the average (arithmetic mean) of the four numbers K, 2K + 3, 3K – 5 and 5K + 1 is 30, what is the value of K?