If the average (arithmetic mean) of 5b,6b+4,7b,8b-4 and 2b is 140, what is the value of b?
Choose the most appropriate option.
A) 20
B) 22
C) 25
D) 30
E) 48
AM of 5b,6b+4,7b,8b-4 and 2b=5b+6b+4+7b+8b-4+2b= 28b/5   Given that 28b /5 5 +6 +4+7 +8 -4+2= 
<gadget id="calculator">5 +6 +4+7 +8 -4+2</gadget>
<output>28</output>
28b/5   Given that 28b /5= 140   b= 25   Answer is 25
<result>C</result>
If the average (arithmetic mean) of 5b,6b+4,7b,8b-4 and 2b is 140, what is the value of b?