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Mathematical Skills | Average

Q. No. 7:Of the three numbers, the first is twice the second and the second twice the third. The average of these numbers is 21. ind the largest number out of these.
A :
36
B :
38
C :
47
D :
48
Q. No. 8:The weight in kilograms of 10 students are 52,45,31,35,40,55,60,38,44,36. If 44 is replaced by 46 and 40 is replaced by 35, then new median will be
A :
42
B :
40.5
C :
40
D :
41.5
Q. No. 9:In the first 10 overs of a cricket, the run rate was only 3.2. What should be the run rate in the remaining 40 overs to reach the target of 282 runs?
A :
6.50
B :
6.75
C :
6.25
D :
7.00
Q. No. 10:In a class, the average score of girls in an examination is 73 and that of boys is 71. The average score for the whole class is 71.8. The percentage of the girls in the class is
A :
60%
B :
40%
C :
35%
D :
30%
Q. No. 11:The average of 10 numbers is 40.2. Later it is found that two numbers have been wrongly added. The first is 18 greater than the actual number and second number added is 13 instead of 31. Find the correct average.
A :
40.2
B :
40.4
C :
40.6
D :
40.8
Q. No. 12:The average salary of all the workers in a workshop is Rs 8000. The average salary of 7 technicians is Rs 12,000 and the average salary of the rest is Rs 6,000. The total number of workers in the workshop is
A :
23
B :
22
C :
21
D :
20
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