the average ( arithmetic mean ) of the integers from 200 to 800 , inclusive , is how much greater than the average of the integers from 50 to 300 , inclusive ?
"for an ap the mean or average of series is average of first and last term . so , average of numbers between 200 to 800 , inclusive = ( 200 + 800 ) / 2 = 500 average of numbers between 50 to 300 , inclusive = ( 50 + 300 ) / 2 = 175 difference = 500 - 175 = 425 answer is d"
subtract(divide(add(200, 800), const_2), divide(add(50, 300), const_2))