In a hall, 50% of the 2100 students are boys. Some boys went to the field to pitch tents while the rest stayed in hall and prepared food. Of the students remaining in the hall, 30% were boys. How many boys went to pitch tents?

80% of the people who signed up for a competition were adults. 70% of the children who signed up for the competition were boys. 60 more boys than girls signed up for the competition. After some more boys signed up for the competition, 25% of the people who signed up for the competition were boys. How many more boys signed up for the competition?

In a class, 45% of the students are boys. 40% of the boys and 60% of the girls love jogging. What is the percentage of students who love jogging?

Class Z has 50% more students than class Y. Number of girls in class Y is equal to number of boys in class Z. The percentage of girls is the same in both classes. What percentage of the student group are boys?

In a school, 20% of the students are girls, and the rest are boys. If there are 750 boys, how many students are in the school in total?

In a class, 60% of students are from India and 50% of the students are girls. If 30% of the Indian students are girls, then what percentage of foreign students are boys?