If the average (arithmetic mean) of a and b is 100, and c – a = 120, what is the average of b and c?	Pick:  A) 150  B) 140  C) 160  D) 170  E) 180
a+b/2 = 100   =&gt; a+b = 200   a = c - 120...sub this value   c-120+b = 200   =&gt;c+b = 320   =&gt;c+b/2 = 160   Answer : 160
<result>C</result>
If the average (arithmetic mean) of a and b is 100, and c – a = 120, what is the average of b and c?