If the average (arithmetic mean) of a and b is 110, and the average of b and c is 160, what is the value of a − c?  Choose the most appropriate option.
A) −220 B) −100 C) 100 D) 135 E) It cannot be determined from the information given
(a + b)/ 2 =110 ===&gt; a + b = 220   (b + c)/2 = 160 ===&gt; b + c = 320   (a + b) - (b + c) = 220 - 320 ===&gt; a + b - b - c = - 100 ===&gt; a - c = - 100   Answer: −100
<result>B</result>
If the average (arithmetic mean) of a and b is 110, and the average of b and c is 160, what is the value of a − c?