Find the value of x when the average of 3x,(5x+6),(7x-4) is 51? Choose the correct choice from the following answers
A) 5
B) 10
C) 15
D) 12
E) 20
Average = (3x+5x+6+7x-4)/3 = (15x+3)/3 = 5x+1   5x+1 = 51   x = 50/5= 
<gadget id="calculator">50/5</gadget>
<output>10</output>
10   Answer is 10
<result>B</result>
Find the value of x when the average of 3x,(5x+6),(7x-4) is 51?