In a class there are certain number of students and their average weight is 15 kg. If 6 students with average weight of 18 kg join or 9 students with average weight of 14 kg leaves, then in both the cases weight of students remains same. How many students are there initially in a class?
In a class there are total 63 students. The average age of girls is 24 years and that of boys is 21 years. If the average age of whole class is 22 years and 8 months, then how many boys are there in a class?
In a hostel, there is food provision enough for 60 days for certain number of students. If after 12 days, 80 more students joins so the remaining food quantity can last only for next 36 days. How many students were there initially in the hostel?
There are 31 students in a class, number of girls is one more then number of guys. We need to form a team of four students. All four in the team cannot be from same gender and number of girls and guys in the team should not be equal. How many ways can such a team be made?
Ambreesh ranks sixteenth from the top and forty ninth from the bottom in a class. How many students are there in the class ?
