The average mathematics marks of two section A and B of class IX in the annual examination is 74. The average marks of Section A is 77.5 and that of Section B is 70. The ratio of number of student of section A and B is:

The ratio of 45% of 80% of A to 30% of 40% of B is 15: 4. If the average of A and B is 67.5, what is the value of AB?

In two successive year 100 and 75 students of school appeared at the final examination. Respectively 75% and 60 % of them passed. The average rate of pass is:

Some students (only boys and girls) from different schools1 appeared for an Olympiad exam. 20% of the boys and 15% of the girls failed the exam. The number of boys who passed the exam was 70 more than that of the girls who passed the exam'. A total of 90 students failed. Find the number of students that appeared for the exam.

If the present population of a village is 55,566, which was 35000 2 years ago, then find the rate of increase of population per year.

The difference of two numbers is 15 % of their sum. the ratio of the larger number to the smaller number is: 

Average salary of Santosh and Renu is Rs 3600. If salary of Santosh and Renu is increased by 50% and 30% respectively then their total salary is increased by 35% then find salary of Renu is what percent more or less than salary of Santosh before increment?

In a class, the average score of girls in an examination is 73 and that of boys is 71. The average score for the whole class is 71.8. Find the percentage of girls.