A pupil’s marks were wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half. The number of pupils in the class is (a) 10      (b) 20      (c) 40    (d) 73

The average marks of boys in a class is 52 and that of girls is 42. The average marks of boys and girls combined is 50. The percentage of boys in the class is (1) 40 (2) 20 (3) 80 (4) 60

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. (a) 15 (b) 30 (c) 45 (d) 50

While tabulation of marks scored in an examination by the students of a class, by mistake the marks scored by one student got recorded as 93 in place of 63, and thereby the average marks increased by 0.5. What was the number of students in the class?

The average marks obtained by 22 candidates in an examination is 45. The average marks of the first ten are 55 and that of the last eleven are 40. The number of marks obtained by the 11th candidate is (a) 0 (b) 45 (c) 47.5 (d) 50

Average of the marks in maths of 40 students in a class was 74 . The mean of marks for boys was 72, while their number was 21 . The mean of marks of girls in the class was

The average age of an adult class is 40 years.12 new students with an average age of 32 years join the class,thereby decreasing the average by 4 years.The original strength of the class was ( a ) 10 (b) 11 (c) 12 . (d) 15

The average marks of 48 students in a class is 45. the average marks of the boys in the class is 40 and average marks of the girls in the class is 50. what is the ratio between the numbers of boys and the number of girls in the class ?

The average of 10 numbers is 40.2. Later it is found that two numbers have been wrongly added.The first is 18 greater than the actual number and the second number added is 13 instead of 33. Find the correct average.(a) 40.2 (b) 40.4 (c) 40.6 (d) 40.8

In a class of 60 students there are 20 girls who scored an average of 40 marks in the test, what is the average marks of the boys if the class average is 60 marks?