Mathematical Ability - Averages
Exam Duration: 30 Mins Total Questions : 15
Six friends have an average height of 167 cms. Raju with a height of 162 cm leaves. What is the new average height?
- (a)
166 cm
- (b)
167 cm
- (c)
168 cm
- (d)
169 cm
9 men went to a hotel. 8 of them spent Rs.3 each over their meals and the ninth spend Rs.2 more than the average expenditure of all nine. Find the total money spent by all of them.
- (a)
Rs.26
- (b)
Rs.40
- (c)
Rs.29.25
- (d)
27
A group of 6 students has an average weight of 55 kg if one of them is removed then the average of the remaining changes to 59 kg. What is the weight of the student who was removed?
- (a)
37 kg
- (b)
36 kg
- (c)
35 kg
- (d)
34 kg
Three years ago, the average age of A, B and C was 27 years and that of Band e five years ago was 20 years. A's present age is
- (a)
30 years
- (b)
35 years
- (c)
40 years
- (d)
48 years
Three years ago, the average age of a family of 5 members was 17 years. A baby having been born, the average of the family is the same today. What is the age of the baby?
- (a)
1 year
- (b)
2 years
- (c)
6 months
- (d)
9 months
A certain number of trucks were required to transport 60 tons of steel wire from the TISCO factory in Jamshedpur. However, it was found that since each truck could take 0.5 tons of cargo less, another 4 trucks were needed. How many trucks were initially planned to be used?
- (a)
10
- (b)
15
- (c)
20
- (d)
25
In an exam, the average was found to be x marks. After deducting computational error, the average marks of 94 candidates got reduced from 84 to 64. The average thus came down by 18.8 marks. The numbers of candidates who took the exam were:
- (a)
100
- (b)
90
- (c)
110
- (d)
105
An investor in shares makes a profit of Rs.920 in his fifth investment, by increasing his average profit of first four investments by Rs.14. His average profit over the first four investments is
- (a)
906
- (b)
976
- (c)
850
- (d)
None of these
The average number of printing errors per page in a book of 512 pages is 4. If the total number of printing errors in the first 302 pages is 1,208, the average number of printing errors per page in the remaining pages is
- (a)
0
- (b)
4
- (c)
840
- (d)
90
In a factory, the average salary of the employees is Rs.70. If the average salary of 12 officers is Rs.400 and that of the remaining employees is Rs.60, then the number of employees are
- (a)
396
- (b)
400
- (c)
408
- (d)
404
If the average of 20 numbers is 100, then the sum of the number is
- (a)
5
- (b)
200
- (c)
100
- (d)
2000
Liquid A weighs \(3\frac{1}{2}\) kg per litre and liquid B weighs 2 kg per litre. What will be weight in kg of a 3 litre mixture having 25% liquid A and 75% liquid B?
- (a)
\(7\frac{1}{8}\)
- (b)
\(5\frac{1}{2}\)
- (c)
8
- (d)
\(8\frac{1}{8}\)
The average marks of a student in 8 subjects is 87. Of these, the highest marks is 2 more than the one next in value If these two subjects are eliminated, the average marks of the remaining subjects is 85. What is the highest marks obtained by him?
- (a)
91
- (b)
94
- (c)
89
- (d)
96
The average age of 60 students in a class is 12 years, that of 15 students is 9 years and that of another 5 of them is 13 years. What is the average age of the remaining students?
- (a)
12 years
- (b)
13 years
- (c)
15 years
- (d)
11 years
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)
58 kg
- (b)
52 kg
- (c)
66 kg
- (d)
68 kg