Quiz Discussion

If the mean of 4 observations is 20, when a constant 'c' is added to each observation, the mean becomes 22. The value of c is :

Course Name: Quantitative Aptitude

  • 1]

    6

  • 2]

    -2

  • 3]

    2

  • 4]

    4

Solution
No Solution Present Yet

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# Quiz
1
Discuss

The average marks obtained by a class of 60 students is 65. The average marks of half of the students is found to be 85. The average marks of the remaining students is :

  • 1] 35
  • 2] 45
  • 3] 55
  • 4] 65
Solution
2
Discuss

The average weight of 3 men, A, B and C is 84 kg. Another man D joins the group and the average now becomes 80 kg. If another man E whose weight is 3 kg more than that of D, replaces A then the average weight of B, C, D and E becomes 79 kg. What is the weight of A ?

  • 1] 70 kg
  • 2] 72 kg
  • 3] 75 kg
  • 4] 80 kg
Solution
3
Discuss

The average of five numbers is 7. If three new numbers would be added, then the new average comes out to be 8.5. What is the average of those three new numbers ?

  • 1] 9
  • 2] 10.5
  • 3] 11
  • 4] 11.5
Solution
4
Discuss

The average (arithmetic mean) of 330, 360 and 390 is :

  • 1]

    \({3^{27}} + {3^{57}} + {3^{87}}\)

  • 2]

    \({3^{29}} + {3^{59}} + {3^{89}}\)

  • 3]

    \({3^{60}}\)

  • 4]

    \({3^{177}}\)

Solution
5
Discuss

Ajay working in a Cellular company as a salesman. His monthly salary is Rs. 200. But he gets bonus as per given rule. If he sells sim cards of Rs. X then his bonus will be   . In the first quarter of the year his average sale was Rs. 3000 per month. In the next 5 five month his average sale was Rs. 5000 per month and for next four month his average sale was Rs. 8000 per month. What is the average earning per month for the whole year?

 

  • 1] Rs. 3350
  • 2] Rs. 3610
  • 3] Rs. 3750
  • 4] Rs. 3560
  • 5] None of these
Solution
6
Discuss

If 25a + 25b = 115, what is the average of a and b?

  • 1] 2.5
  • 2] 3.4
  • 3] 4.5
  • 4] 4.6
  • 5] None of these
Solution
7
Discuss

Sachin Tendulkar has a certain average for 11 innings. In the 12th innings he scores 120 runs and thereby increases his average by 5 runs. His new average is :

  • 1] 60
  • 2] 62
  • 3] 65
  • 4] 66
Solution
8
Discuss

The average age of group of 20 girls is 15 years and that of another group of 25 boys it is 24 years. The average age of the two groups mixed together is :

  • 1] 19.5 yearas
  • 2] 20 years
  • 3] 21 yearas
  • 4] 21.5 years
Solution
9
Discuss

After replacing an old member by a new member, it was found that the average age of five members of a club is the same as it was 3 years ago. What is the difference between the ages of the replaced and the new member?

  • 1] 2 years
  • 2] 4 years
  • 3] 8 years
  • 4] 15 years
Solution
10
Discuss

The average of the ages of Sumit, Krishna and Rishabh is 43 and the average of the ages of Sumit, Rishabh and Rohit is 49. If Rohit is 54 years old, what is Krishna’s age?

  • 1] 24 years
  • 2] 36 years
  • 3] 45 years
  • 4] Cannot be determined
  • 5] None of these
Solution
# Quiz