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Averages 1/5

25. The average of marks obtained by 120 candidates was 35. If the average of marks of passed candidates was 39 and that of failed candidates was 15, the number of candidates who passed the examination is :
a. 100
b. 110
c. 120
d. 150


26. The average expenditure of a man for the first five months is Rs.120 and for the next seven months it is Rs.130. If he saves Rs.290 in that year, his monthly average income is :
a. Rs.140
b. Rs.150
c. Rs.160
d. Rs.170


27. The average salary of 20 workers in an office is Rs.1900 per month. If the manager's salary is added, the average salary becomes Rs.2000 p.m. What is the manager's annual salary?
a. Rs.24,000
b. Rs.25,200
c. Rs.45,600
d. None of these


28. The average weight of a class of 40 students is 40 kg. If the weight of the teacher is included, the average weight increases by 500 gms. The weight of the teacher is :
a. 40.5 kg
b. 60 kg
c. 60.5 kg
d. 62 kg


29. The average weight of 8 men is increased by 2 kg when one of the men, whose weight is 50 kg is replaced by a new man. The weight of the new man is :
a. 52 kg
b. 58 kg
c. 66 kg
d. 68 kg


30. The average weight of 8 persons is increased by 2.5 kg, When one of them whose weight is 56 kg is replaced by a new man. The weight of the new man is :
a. 66 kg
b. 75 kg
c. 76 kg
d. 86 kg


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