All the girls of Mary's class are standing in a row. Mary is the 11th girl from both ends. How many girls are studying in Mary's class?
10 + Mary + 10 = 21 girls
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 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?
Kajal is teaching a class of thirty pupils, of which fourteen are girls. She knows that there are twenty-two pupils who are right-handed.
What is the minimum number of girls who are right handed in this 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'?
Every student in a second grade class sends a valentine to each of the other students in the class, for a total of 306 valentines. How many students are in the class?
