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Average mark in Math in a class of 40 students is 45. Average mark of all the 30 boys is 50. Then the average mark obtained by the girls is :

Correct Answer: 30
No. of students = 40 No. of Boys = 30 No. of Girls = 10 Average of 40 stuents = 45 Total of students = 45 *40 = 1800 Aerage of 30 students = 50 Total of 30 = 30 * 50 = 1500 Total of 10 girls = 1800 - 1500 = 300 Average mark of 10 girls = 300/10 = 30

The ratio of boys to girls in class A is 3 to 4 . The ratio of boys to girls in class B is 4 to 5 . If the two classes were combined, the ratio of boys to girls in class B is two less than the number of girls in class A. How many girls are in class A?

In a class there are certain no. of boys and girls. If 15 girls are absent then no. of boys will be twice that of girls. If 45 boys are absent then girls strength will be 5 times that of boys. Find number of boys actually present ?

In a class of 60 students, 20 students like Math, 25 students like English and 30 students like Science. If 5 Students like both Math and Science, 8 Students like both English and Science and 3 students like neither of these subjects, how many students like all of the three subjects?

The ratio of boys to girls in a class 2/5. If 2 boys leave and 4 girls join the class, the ratio of the boys to the girls becomes 1/4. Originally, how many girls were in the class?

The ratio between boys and girls in a class is 2 : 5 . If 2 boys leave and 4 girls join the class, the ratio of the boys to the girls becomes 1 :4 what is the original number of girls in the class?

Ten bools are arranged in a row following a certain sequence.Among them 3 History,3 are Economics, 2 are Math's and are English.From the left,There is English book between a History and Math's book, a History book between a Math's and an English book, an Economics book between an English and a Math's Book Math's book between two Economics books and two Economics book between Math's and a History book.Book of which subject is at the sixth position from the left?

In a school, 40% of the students are male and all the students like either math or English. If 60% of the students like math and 30% of the students are male who like English, what percentage students of the class are female students who like English?

In a class of 60 students, the number of boys and girls participating in the annual sports is in the ratio 3 : 2 respectively. The number of girls not participating in the sports is 5 more than the number of boys not participating in the sports. If the number of boys participating in the sports is 15, then how many girls are there in the class ?

The average score of a class of boys and girls in an examination is A. The ratio of boys and girls in the class is 3 : 1. If the average score of the boys is A + 1, the average score of the girls is-

The average age of all the students of a class is 18 years. The average age of boys of the class is 20 years and that of the girls is 15 years. If the number of girls in the class is 20, then find the number of boys in the class.