in a hostel there were 100 students . to accommodate 20 more students the average is decreased by rupees 5 . but total expenditure increased by rs . 400 . find the total expenditure of the hostel now ?
"100 x + 400 = 12 ( x – 5 ) x = 50 100 * 50 + 400 = 5400 answer : c"
multiply(subtract(divide(add(multiply(add(100, 20), 5), 400), 20), 5), add(100, 20))