AVERAGE MCQ SET 7
1. The average weight of some girls in a group is 54.8 kg . When 5 girls of average weight 56.4 kg leave the group and 10 girls of average weight 57.5 kg joins the group , then the average weight of the girls in the group increases by 380 g .ย The number of girls , initially , in the group was :
(a) 50
(b) 45
(c) 55
(d) 40
Answer: B
2. Average weight of four men A , B , C , D is 68 kg . If 5th man E enters the group the average weight decreases by 2 kg . The average weight becomes 65 kg if a man F comes in place of A and whose weight is 4 kg more than weight of E . Find the weight of A .
(a) 64 kg
(b) 67 kg
(c) 70 kg
(d) 74 kg
Answer: B
3. A is the average of 10 given numbers . B is the average after 2 of the numbers were replaced by 3 other different numbers . The average of the removed numbers is 48 and the average of the newly number is 56 . If A + B = 438 , then the value of A – B is :
(a) 21
(b) 14
(c) 12
(d) 26
Answer: B
4. Average of the marks of 132 students of a college is 50 . If the average of the marks of the passed students is 55 and the average of the marks of the failed students is 35 , then what will be the respective ratio of the total marks of passed students and the total marks of failed students ?
(a) 1 : 3
(b) 11 : 7
(c) 33 : 7
(d) 21 : 8
Answer: C
5. Rakesh runs a coaching institute having 50 faculty members . The average monthly salary of 35 faculty members is Rs.37,500 . What will be the average monthly salary (in Rs.) of the other 15 faculty members , if the average monthly salary of all the 50 faculty members is found to be Rs.30,000 ?
(a) 12,000
(b) 13,000
(c) 12,500
(d) 13,500
Answer: C
6. In a class of 60 students , 20 are girls . The average weight of the boys in the class is 40kg , while that of all the girls is 35 kg . What is the average weight (in kg) of the entire class (correct to two decimal places) ?
(a) 36.67
(b) 38.33
(c) 33.33
(d) 40.67
Answer: B
7. The average marks obtained by 80 students in an examination is 50 . If the average marks of passes students is 55 and the number of students who failed the examination are 30 , then what is the average marks of students who failed the examination ?
(a) 41.66
(b) 46.66
(c) 40.33
(d) 52.33
ย Answer: A
8. Sunidhi earned an average of Rs.6250 per month during the part 12 months . During the first 10 months her average earning per month was Rs.5800 . What was Sunidhi’s average earning per month during the last two months of the period ?
(a) Rs.8500
(b) Rs.7750
(c)Rs.8750
(d) Rs.8250
Answer: A
9. The average height of girls in a group is 154 cm and the average height of boys in the group is 3cm more than the average height of all the boys and girls in the group . If the numbers of girls is 25% less than the number of boys , then what is the average height (in cm) of the boys ?
(a) 159
(b) 158
(c) 161
(d) 160
Answer: C
10. Out of 72 students in a class , the number of boys is 40% more than the number of girls . The average score of all the students in a test is 63 . If the average score of the girls is 30% more than that of the boys , then what is the average score of the girls ?
(a) 71.5
(b) 74.1
(c) 72.8
(d) 70.2
Answer: C
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