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 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 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

Mean mark scored by the students of a class is 53. The mean mark of the girls is 55 and the mean mark of the boys is 50. What is the percentage of girls in the class ? a) 60% b) 40% c) 50% d) 45%

The class mark of the class interval 120-130 is...a) 125 b) 122.5 c) 120 d) 130

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?

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