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 ?
"( a + b ) / 2 = 110 = = = > a + b = 220 ( b + c ) / 2 = 160 = = = > b + c = 320 ( a + b ) - ( b + c ) = 220 - 320 = = = > a + b - b - c = - 100 = = = > a - c = - 100 answer : b"
subtract(multiply(const_60.0, const_2), multiply(110, const_2))