Search questions

The average age of group $A$ consisting of 25 students is 18 years. The average age of group B consisting of 50 students is ' x ' years. The combined average age of both groups together is 22 years. What is the value of ' $x$ '?

A group of 8 students appeared for a chemistry test. The average of the top 4 scores was 88.5 , and the average of the bottom 4 scores was 74. Later, it was found that a decimal error had occurred, and one of the scores from the bottom half was recorded as 71.2 instead of 91.2. What is the corrected overall average of the group?

Three groups of students have average marks 60,70 , and 80 respectively. The number of students in these groups are 30,50 , and 30 . What is the combined average of all students ?

A teacher calculated the average marks of 20 students in a test as 65 . Later, she found that the marks of one student were wrongly entered as 45 instead of 85 . After correcting the error, what is the correct average mark of the class?

The average of 17 numbers is 32 . If each number is doubled and then 8 is added to each, what will be the new average ?

A batsman typically scores 50 runs in 30 innings. To raise his average by two, how many runs does he need to score in the thirty-first inning?

The average marks of 10 students in a mathematics test are 73.5. Later, it was found that one student's score was misread as 45 instead of 54. After correcting this error, another student's marks were removed for being invalid, and the average of the remaining 9 students rose to 76.2 . Find the marks of the student whose score was removed.

The average of 8 numbers is 25 . If two numbers 35 and 45 are removed, what is the new average of the remaining numbers?

A factory hired 10 workers and found that their average productivity per day was 43.75 unit. Later, 3 more workers were hired. The average productivity of all 13 workers then became 46.5 units. However, one of the new 3 workers made 50.2 unit daily, and another made 46.4 unit daily. What is the daily productivity of the third new worker?

The average of 15 numbers is 30 . If 5 is added to 40% of the numbers and 3 is subtracted from the remaining 60% of the numbers, what will be the new average?

The average of 7 consecutive odd natural numbers is 39. Previous 7 consecutive odd natural numbers to these 7 odd natural numbers are also included. What will be the average of newly added numbers ?

The average of 5 consecutive odd natural numbers is 57. Previous 5 consecutive odd natural numbers to these 5 odd natural numbers are also included. What will be the average of newly added numbers?

There are 20 players in a team. The average age of these 20 players is ' $X$ '. 10 new players joined the team. There is no change in the average age of the team. What is the total age of these 10 players?

In a science club, the average score of 20 students in a monthly test is 68.5. After including the scores of 4 more students, the overall average becomes 70.2 . If the scores of two of the new students are 72.5 and 75.5 , respectively, and the remaining two students have equal scores, find the score of each of the remaining two students.

The average marks of 40 students is 66 . If one student who scored 50 is replaced by another who scored 90 , what will be the new average ?

The average of 10 numbers is 55. If each of the first 5 numbers is increased by 6 and each of the last 5 numbers is decreased by 4, what will be the new average ?

The average of 5 numbers is 30 . If three of the numbers are 22, 26, and 34, then what is the average of the remaining two numbers ?

The average weight of 28 students is 65 kg . When the teacher's weight is included, the average becomes 67 kg . What is the weight of the teacher ?