there is enough provisions for 100 girls in a hostel for 50 days . if there were 20 men less , how long will the provision last ?
we have , m 1 d 1 = m 2 d 2 100 * 50 = 20 * d 2 d 2 = 100 * 50 / 20 = 250 days . answer : a
add(divide(multiply(100, 20), const_10), 50)