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?
There are 96 boys and 84 girls in a class. If 60% of the total students leave the class and 'n' number of girls joined again and the ratio of boys to girls become 4:5. What is the value of 'n'?
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?
In a class of 60 students, where the number of girls is twice that of boys, Kamal, a boy ranked seventeenth from the top. If there are 9 girls ahead of Kamal, how many of boys in rank after him?
