if the average ( arithmetic mean ) of a and b is 45 and the average of b and c is 85, what is the value of c â ˆ ’ a?
Choose the correct choice from the following options.
A) 25	B) 80	C) 90	D) 140	E) it can not be determined from the information given
<gadget id="calculator">85 * 2</gadget>
<output>170</output>

<gadget id="calculator">45 * 2</gadget>
<output>90</output>

<gadget id="calculator">170 - 90</gadget>
<output>80</output>

<result>B</result>
if the average ( arithmetic mean ) of a and b is 45 and the average of b and c is 85, what is the value of c â ˆ ’ a?
subtract(multiply(85, const_2), multiply(45, const_2))
"the arithmetic mean of a and b = ( a + b ) / 2 = 45 - - a + b = 90 - - 1 similarly for b + c = 170 - - 2 subtracting 1 from 2 we have c - a = 80 ; answer : b"