During a certain operation B persons are successfully recovered every year. If A persons are treated during the last 5 years what will be the average death rate per year.
The average weight of the class of 35 students was 45 kg. With the admission of a new student the average weight came down to 44.5 kg. Find the weight of new student.
The average age of a class is 12 years and total age is 300 years. If a student of age 15 years is now admitted then find the average of the new class.
Ali drove at 50 km per hour for first three hours of his trip. Then due to heavy traffic he drove at 40 km per hour for two hours. Find his agerage speed for the trip.