in a hostel there were 100 students . to accommodate 25 more students the average is decreased by some rupees . but total expenditure increased by rs . 500 . if the total expenditure of the hostel now 8500 , find decrease of average budget ?
"let average is x 100 x + 500 = 8500 x = 80 let decrease = y 125 ( 80 – y ) = 8500 y = 12 answer : c"
multiply(subtract(divide(add(multiply(add(100, 25), 500), 8500), 25), 500), add(100, 25))