1) there is two section A and B of a class consisting of 36 and 44 students respectively. If the average weight of sec A is 40kg and average weight of sec B is 35 KG. Find the average weight of whole class?
A) 27.25
B)37.25
C) 25.27
D) 35.37
E) none
2) Nine person went to a hotel for taking their meals. Eight of them spent Rs 12 each . And ninth one spent Rs 8 more than the average expenditure of all nine. What was the total money spent by them ?
A) 118
B) 117
C) 119
D) 115
E) none
3) Of the three numbers., second is twice the first and is also thrice the third. If the average of all three numbers is 44. Find thr largest number?
A) 48
B) 36
C) 24
D) 72
E) none
4) The average of 25 results is 18. The average of first twelve of them is 14 and last twelve is 17. Find the 13th number?
A) 78
B) 67
C) 87
D) 68
E) none
5) The average weight of A.B.C is 45 kg. If the average of A and B is 40kg. And that of B and C is 43 kg. Find the weight of B ?
A) 41
B) 31
C) 45
D) 40
E ) none
6) The average weight of a class of 39 students is 15years. If the age of the teacher be included. Then the average age increase by 3months. Find the age of teacher?
A) 26
B) 24
C) 23
D) 25
E) none
7)The mean weight of a group of seven boys is
56 kg. The individual weights (in kg) of six of
them are 52, 57, 55, 60, 59 and 55. Find the
weight of the seventh boy.
A)54
B) 55
C) 56
D) 52
E) none
8) A cricketer has a mean score of 58 runs in nine
innings. Find out how many runs are to be scored
by him in the tenth innings to raise the mean
score to 61.
A) 77
B) 88
C) 78
D) 58
E) 68
9) The mean of five numbers is 28. If one of the
numbers is excluded, the mean gets reduced by 2.
Find the excluded number.
A) 36
B) 26
C) 35
D) 30
E) none
10) The average height of 30 boys was calculated
to be 150 cm. It was detected later that one
value of 165 cm was wrongly copied as 135 cm
for the computation of the mean. Find the correct
mean.
A) 151
B) 161
C) 152
D) 162
E) none
Explanation :
1) B
{(36×40)+(44×35)}÷80=37.25
2) B
Let average is x
Total=9x
(12×8)+x+8=9x
X=13
9x=117
3) D
Let 2nd num 6x
1st num 3x
3rd num 2x
(3x+6x+2x)÷3=44
X=12
6x=72
4) A
(25×18)-{(12×14)+(12×17)}=78
5) B
{(40×2)+(43×2)}-(45×3)=31
6) D
39×3=117month will increase
teacher age= 15year 3month+117month
=15year+120month
=25year
7) A
(56×7)-(52+57+55+60+59+55)=54
8) B
(61×10)-(58×9)=88
9) A
(28×5)-(26×4)=36
10) A
(165-135)÷30=1 will be increase
150+1=151
A) 27.25
B)37.25
C) 25.27
D) 35.37
E) none
2) Nine person went to a hotel for taking their meals. Eight of them spent Rs 12 each . And ninth one spent Rs 8 more than the average expenditure of all nine. What was the total money spent by them ?
A) 118
B) 117
C) 119
D) 115
E) none
3) Of the three numbers., second is twice the first and is also thrice the third. If the average of all three numbers is 44. Find thr largest number?
A) 48
B) 36
C) 24
D) 72
E) none
4) The average of 25 results is 18. The average of first twelve of them is 14 and last twelve is 17. Find the 13th number?
A) 78
B) 67
C) 87
D) 68
E) none
5) The average weight of A.B.C is 45 kg. If the average of A and B is 40kg. And that of B and C is 43 kg. Find the weight of B ?
A) 41
B) 31
C) 45
D) 40
E ) none
6) The average weight of a class of 39 students is 15years. If the age of the teacher be included. Then the average age increase by 3months. Find the age of teacher?
A) 26
B) 24
C) 23
D) 25
E) none
7)The mean weight of a group of seven boys is
56 kg. The individual weights (in kg) of six of
them are 52, 57, 55, 60, 59 and 55. Find the
weight of the seventh boy.
A)54
B) 55
C) 56
D) 52
E) none
8) A cricketer has a mean score of 58 runs in nine
innings. Find out how many runs are to be scored
by him in the tenth innings to raise the mean
score to 61.
A) 77
B) 88
C) 78
D) 58
E) 68
9) The mean of five numbers is 28. If one of the
numbers is excluded, the mean gets reduced by 2.
Find the excluded number.
A) 36
B) 26
C) 35
D) 30
E) none
10) The average height of 30 boys was calculated
to be 150 cm. It was detected later that one
value of 165 cm was wrongly copied as 135 cm
for the computation of the mean. Find the correct
mean.
A) 151
B) 161
C) 152
D) 162
E) none
Explanation :
1) B
{(36×40)+(44×35)}÷80=37.25
2) B
Let average is x
Total=9x
(12×8)+x+8=9x
X=13
9x=117
3) D
Let 2nd num 6x
1st num 3x
3rd num 2x
(3x+6x+2x)÷3=44
X=12
6x=72
4) A
(25×18)-{(12×14)+(12×17)}=78
5) B
{(40×2)+(43×2)}-(45×3)=31
6) D
39×3=117month will increase
teacher age= 15year 3month+117month
=15year+120month
=25year
7) A
(56×7)-(52+57+55+60+59+55)=54
8) B
(61×10)-(58×9)=88
9) A
(28×5)-(26×4)=36
10) A
(165-135)÷30=1 will be increase
150+1=151
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