Question : The average mark obtained by a class of 60 students is 65. The average marks of half of the students were found to be 85. The average marks of the remaining students are:

Option 1: 35

Option 2: 45

Option 3: 55

Option 4: 65

Question : The average mark obtained in a class of 50 students is 70%. The average of the first 25 is 60% and that of 24 is 80%. What were the marks obtained by the last student?

Option 1: 90%

Option 2: 60%

Option 3: 80%

Option 4: 70%

Question : A student's marks were wrongly entered as 65 instead of 45. Due to this, the average marks for the class got increased by $\frac{1}{3}$. The number of students in the class is:

Option 1: 40

Option 2: 20

Option 3: 60

Option 4: 30

Question : The average mark of 60 students in a class is 62. The average marks of boys and girls in that subject are 60 and 65, respectively. The number of boys in the class is:

Option 1: 36

Option 2: 25

Option 3: 41

Option 4: 34

Question : In an examination, the average marks obtained by the girls of a class is 85 and the average marks obtained by the boys of the same class is 87. If the girls and boys are in the ratio of 4 : 5, the average marks of the whole class (approximately) are closest to:

Option 1: 85.9

Option 2: 86.1

Option 3: 86.4

Option 4: 86.5