Quiz Discussion

The average of marks in Mathematics for 5 students was found to do 50. Later, it was discovered that in the case of one student the marks 48 were misread as 84. The correct average is :

Course Name: Quantitative Aptitude

  • 1] 40.2
  • 2] 40.8
  • 3] 42.8
  • 4] 48.2
Solution
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# Quiz
1
Discuss

There are two sections A and B of a class, consisting of 36 and 44 students' respectively. If the average weight of section A is 40kg and that of section B is 35kg, find the average weight of the whole class.

  • 1] 30 kg
  • 2] 35 kg
  • 3] 42.5 kg
  • 4] 37.25 kg
Solution
2
Discuss

One-fourth of certain journey is covered at the rate of 25 km/h, one-third at the rate of 30 km/h and the rest at 50 km/h. Find the average speed for the whole journey.

  • 1]

    600/53 km/h

  • 2]

    1200/53 km/h

  • 3]

    1800/53 km/h

  • 4]

    1600/53 km/h

  • 5]

    None of these

Solution
3
Discuss

The average annual income (in Rs.) of certain agricultural workers is S and that of other workers is T. The number of agricultural workers is 11 times that of other workers. Then the average monthly income (in Rs.) of all the workers is 

  • 1]

    (S+T)/2

  • 2]

    (S+11T)/2

  • 3]

    (1/11S)+T

  • 4]

    (11S+T)/12

Solution
4
Discuss

A student finds the average of 10, 2 digits numbers. If the digits of one of the numbers interchanged, the average increases by 3.6. The difference between the digits of the 2 digits number is :

  • 1] 4
  • 2] 3
  • 3] 2
  • 4] 5
Solution
5
Discuss

Out of 9 persons, 8 persons spent Rs. 30 on each of their meals. The ninth one spends Rs. 20 more than the average expenditure of all the nine. The total money spent by all of them was

  • 1]

    Rs 260

  • 2]

    Rs 290

  • 3]

    Rs 292.5

  • 4]

    Rs 400.5

Solution
6
Discuss

The average score of a class of boys and girls in an examination is A. The ratio of boys and girls in the class is 3 : 1. If the average score of the boys is A + 1, the average score of the girls is-

  • 1] A - 1
  • 2] A - 3
  • 3] A + 1
  • 4] A + 3
Solution
7
Discuss

If the arithmetic mean of 0, 5, 4, 3 is a, that of -1, 0, 1, 5, 4, 3 is b and that of 5, 4, 3 is c, then the relation between a, b, and c is

  • 1] a = b = c
  • 2] a : b : c = 3 : 2 : 4
  • 3] 4a = 5b = c
  • 4] a + b + c = 12
Solution
8
Discuss

The average monthly salary of 12 workers and 3 managers in a factory was Rs. 600. When one of the manager whose salary was Rs. 720, was replaced with a new manager, then the average salary of the team went down to 580. What is the salary of the new manager?

  • 1] 640
  • 2] 690
  • 3] 420
  • 4] 570
Solution
9
Discuss

The average score of a cricketer for ten matches is 38.9 runs. If the average for the first six matches is 42, then find the average for the last four matches.

  • 1] 33.25
  • 2] 33.5
  • 3] 34.25
  • 4] 35
Solution
10
Discuss

The average weight of 47 balls is 4 g. if the weight of the bag (in which the balls are kept) be included; the calculated average weight per ball increases by 0.3 g. What is the weight of the bag?

  • 1] 14.8 g
  • 2] 14.4 g
  • 3] 15 g
  • 4] 18.6 g
  • 5] None of these
Solution
# Quiz