In all the three sections of Woodland High school there are 50,70 and 80 students , those who secured F grade are 10% ,20% ,and 30% respectively.What percentage of the total students in the school secured F grade ?

Find the no. of male students (i.e., boys), if there are 42% male students in the school and the total no. of student in the school is 1000.

A school has only four classes that contain 10,20,30 and 40 students respectively. The pass percentage of these classes are 20%, 30%, 60% and 100% respectively. Find the pass % of the entire school.

A class consists of 3 sections A, B and C with 35, 35 and 30 students respectively, The arithmetic means of the marks secured by students of sections A and B, who appeared for a test of 100 marks are 74 and 70 respectively, The arithmetic mean of the marks secured by students of section C, who appeared for a test in the same subject which carried 75 marks is 51. What is the average percentage of marks secured by all the 100 student of the three sections?

In a school 70% of the students are girls.The number of boys are 510.Then the total number of students in the school is:

In a school 60% of the students are girls. If number of boys is 480, then what is the total number of students in the school?