31)

The average weight of some students in a group is 58 kg. If 8 students of average weight 54 kg leave the group, and 3 students weighing 53.6 kg, 54 kg and 57.4 kg join the group, then the average weight of the remaining students in the group will increase by 575 g. The number of students, initially, in the group is

SSC CHSL 2021

A)

35

B)

45

C)

50

D)

40

32)

The average marks obtained by 150 students in a certain examination is 50. If the average marks of the passed students are 54 and that of the students who failed are 30, then what will be the number of the students who failed?

SSC CHSL 2021

A)

25

B)

24

C)

20

D)

28

33)

The average of 5 numbers is 26.4. The first number is one-fifth of the sum of the remaining 4 numbers. What is the first number?

SSC CHSL 2021

A)

22

B)

23

C)

20

D)

21

34)

One-fifth of a journey is covered at a speed of 30 km/h, one-fourth of the journey at a speed of 25 km/h and the rest at 60 km/h. What is the average speed (in km/h, correct to one decimal place) for the whole journey?

SSC CHSL 2021

A)

30.6

B)

40.5

C)

25.4

D)

38.7

35)

The average daily income of Shyam Lal during the month of February 2020 was Rs. 560. The average income for the first 16 days was Rs. 590 and for the last 16 days it was Rs. 500. What was his average income for 14^th, 15^th and 16^th February?

SSC CHSL 2021

A)

Rs. 590

B)

Rs. 587

C)

Rs. 545

D)

Rs. 400

36)

The average of 19 numbers is 48. The average of the first 7 numbers is 50.6 and that of the last 13 numbers is 47.6. If the 7^th number is excluded, then what is the average of the remaining numbers (correct to one decimal place)?

SSC CHSL 2021

A)

49.5

B)

47.3

C)

39.6

D)

42.4

37)

The average height of a certain number of students in a group is 155.6 cm. If 12 students having an average height of 150.5 cm join the group and 7 students having an average height of 159 cm leave the group, the average height of the students in the group will decrease by 34 mm. What is the number of students, initially, in the group?

SSC CHSL 2021

A)

20

B)

25

C)

40

D)

30

38)

The average of eighteen numbers is 42. The average of the last ten numbers is 40 and that of the first five numbers is 44. The seventh number is 6 less than the sixth and 7 less than the eight number. The average of the sixth and the eight number is:

SSC CHSL 2021

A)

45

B)

48

C)

47.5

D)

46.5

39)

The numbers 2, 3, 4 and 5 occur (2 + 5k), (5k - 7), (2k - 3) and (k + 2) times, respectively. The average of the numbers is 2.85. Later on, the number 2 was replaced by 6 in all the places. What is the average of the new numbers?

SSC CHSL 2021

A)

2.4

B)

3.85

C)

5.25

D)

4.75

40)

The average weight of 3 persons A, B and C is 60 kg. When D joins the group, the average weight becomes 65 kg. When another person E whose weight is 3 kg less than that of D replaces A, the average weight of B, C, D and E becomes 67 kg. What is the weight of A?

SSC CHSL 2021

A)

60 kg

B)

72 kg

C)

65 kg

D)

69 kg