Related Questions

Three maths classes: X, Y, and Z take an algebra test. The average score of class X is 83. The average score of class Y is 76. The average score of class Z is 85. The average score of class X and Y is 79 and the average score of class Y and Z is 81. What is the average score of the combined classes X, Y, and Z?
A 81
B 81.5
C 82
D 84.5
Three math classes , X, Y , and Z, take an algebra test. The average score in class X is 83. The average score in class Y is 76. The average score in class Z is 85. The average score of all students in classes X and Y together is 79. The average score of all student classes Y and Z together is 81. What is the average for all the three classes?
A 81
B 81.5
C 82
D 84.5
In a class of 60 students there are 30 girls. The average weight of these girls is 58 Kg and average weight of the full class is 63 kgs. What is the average weight of the boys of the class?
A 67
B 66
C 68
D 65
In a class the average marks attained in an exam is 80. The average of students who scored below 75 is 65. The average of students who scored 75 or more is 90. If the total number of students in this class is 20, how many students scored 75 or more?
A 6
B 8
C 10
D 12
On Tuesday, 30 of the students in a class took a test and their average score was 83.5 . On Thursday , the other 5 students took the test, and their average score was 94. what was the average for the entire class?
A 83.5%
B 84.5%
C 85%
D 88.2%
On Saturday , 20 of the students in a class took a test and their average score was 80. On Tuesday, the other 5 students took the test, and their average score was 90 . what was the average for the entire class?
A 82
B 84
C 85
D 88
On Tuesday, 30 of the students in a class took a test and their average score was 83.5. On Thursday, the other 5 students took the test, and their average score was 94. What was the average for the entire class?
A 83.5%
B 84.5%
C 85%
D 88.2%
In a class average the mark in an exam is 70. The average of students who scored below 60 is 50. The average of students who scored 60 or more is 75. If the total number of students in this class is 20, how many students scored less than 60?
A 4
B 8
C 10
D 16
The average height of girls in a class is 5 ft and that of boys is 5.7 ft. If the average height of the students in class is 5.5 ft, what could be the possible strength of boys and girls respectively in the class.
A 50, 20
B 30, 20
C 20, 30
D 60, 50
The average weight of 50 boys in a class is 45 Kg. When one boy leaves the class, the average reduces by 100g. Find the weight of the boy who left the class.
A 50 Kg
B 50.8 Kg
C 49 Kg
D 49.9 Kg

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