RRB NTPC - Averages (200 Questions with Explanation): Quantitative Aptitude Test

  • 201. The average weight of a class having 25 students is 32 kg. Find the total weight of the class.
   A.) 3200
   B.) 1600
   C.) 1225
   D.) 800

Answer: Option 'D'

Solution is
Given, Average weight = 32 kg
No.of students = 25
Average = Total Quantity / No. of Quantity
=> Total Weight of the class = Average weight x No. of Students
= 32 x 25
= 800
Answer is 800

  • 202. The average weight of a class having 25 students is 32 kg. Find the total weight of the class.
   A.) 3200
   B.) 1600
   C.) 1225
   D.) 800

Answer: Option 'D'

Solution is
Given, Average weight = 32 kg
No.of students = 25
Average = Total Quantity / No. of Quantity
=> Total Weight of the class = Average weight x No. of Students
= 32 x 25
= 800
Answer is 800

  • 203. Find the average of the first 14 natural numbers
   A.) 6.5
   B.) 7.5
   C.) 7
   D.) 8

Answer: Option 'B'

Solution is :
Average of the first n natural numbers = ( n + 1 ) / 2
Average of the first 14 natural numbers = ( 14 + 1 ) / 2
= 15 / 2
= 7.5

  • 204. Find the average of the first 14 natural numbers
   A.) 6.5
   B.) 7.5
   C.) 7
   D.) 8

Answer: Option 'B'

Solution is :
Average of the first n natural numbers = ( n + 1 ) / 2
Average of the first 14 natural numbers = ( 14 + 1 ) / 2
= 15 / 2
= 7.5

  • 205. The average weight of a class having 16 students is 36 kg. Find the total weight of the class.
   A.) 576
   B.) 526
   C.) 496
   D.) 556

Answer: Option 'A'

Solution is :
Given, average weight = 36 kg
No. of students = 16
Average = Total Quantity / No. of Quantity
=> Total weight of the class = Average weight x No. of Students
= 36 × 16
= 576 kg

  • 206. The average weight of a class having 16 students is 36 kg. Find the total weight of the class.
   A.) 576
   B.) 526
   C.) 496
   D.) 556

Answer: Option 'A'

Solution is :
Given, average weight = 36 kg
No. of students = 16
Average = Total Quantity / No. of Quantity
=> Total weight of the class = Average weight x No. of Students
= 36 × 16
= 576 kg

  • 207. Find the average of the first 70 natural numbers ?
   A.) 31.5
   B.) 35.5
   C.) 34.5
   D.) 35

Answer: Option 'B'

Solution is :
Average of the first n natural numbers = ( n + 1 ) / 2
Average of the first 70 natural numbers = ( 70 + 1 ) / 2
= 71 / 2
= 35.5

  • 208. Find the average of the first 70 natural numbers ?
   A.) 31.5
   B.) 35.5
   C.) 34.5
   D.) 35

Answer: Option 'B'

Solution is :
Average of the first n natural numbers = ( n + 1 ) / 2
Average of the first 70 natural numbers = ( 70 + 1 ) / 2
= 71 / 2
= 35.5

  • 209. Find the average of first 26 multiples of 11.
   A.) 148.5
   B.) 149
   C.) 148
   D.) 149.5

Answer: Option 'A'

Average of first 26 natural numbers = ( n + 1 ) / 2
= ( 26 + 1 ) / 2
= 27 / 2
= 13.5
Average of first 26 multiples of 11 = ( Average of first 26 natural numbers ) × 11
= 13.5 × 11
148.5

  • 210. Find the average of first 26 multiples of 11.
   A.) 148.5
   B.) 149
   C.) 148
   D.) 149.5

Answer: Option 'A'

Average of first 26 natural numbers = ( n + 1 ) / 2
= ( 26 + 1 ) / 2
= 27 / 2
= 13.5
Average of first 26 multiples of 11 = ( Average of first 26 natural numbers ) × 11
= 13.5 × 11
148.5

  • 211. The average weight of a class having 14 students is 36 kg. Find the total weight of the class.
   A.) 504
   B.) 514
   C.) 494
   D.) 524

Answer: Option 'A'

Solution is :
Given, Average weight of the class = 36 kg
No. of students in the class = 14
Average = Total Quantity / No. of Quantity
=> Total weight of the class = Average weight x No. of students

= 36 × 14
= 504

  • 212. The average weight of a class having 14 students is 36 kg. Find the total weight of the class.
   A.) 504
   B.) 514
   C.) 494
   D.) 524

Answer: Option 'A'

Solution is :
Given, Average weight of the class = 36 kg
No. of students in the class = 14
Average = Total Quantity / No. of Quantity
=> Total weight of the class = Average weight x No. of students

= 36 × 14
= 504

  • 213. Find the average of first 17 multiples of 3
   A.) 6.33
   B.) 27
   C.) 20
   D.) 7.33

Answer: Option ''

Solution is
Given

Average of first 17 natural numbers= (n + 1 ) / 2 
=(18 / 2 )
= 9
Average of first 17 multiples of 3 =(Average of first 17 natural numbers) x 3
= 9 x 3

  • 214. Find the average of first 17 multiples of 3
   A.) 6.33
   B.) 27
   C.) 20
   D.) 7.33

Answer: Option ''

Solution is
Given

Average of first 17 natural numbers= (n + 1 ) / 2 
=(18 / 2 )
= 9
Average of first 17 multiples of 3 =(Average of first 17 natural numbers) x 3
= 9 x 3

  • 215. The average weight of a class having 14 students is 36 kg. Find the total weight of the class. 
   A.) 504
   B.)  514
   C.) 524
   D.) 494

Answer: Option 'A'

Total quantity = Average x No. of Quantity
Total weight = Average weight x No.of students

= 36 x 14
= 504 kg

  • 216. The average weight of a class having 14 students is 36 kg. Find the total weight of the class. 
   A.) 504
   B.)  514
   C.) 524
   D.) 494

Answer: Option 'A'

Total quantity = Average x No. of Quantity
Total weight = Average weight x No.of students

= 36 x 14
= 504 kg

  • 217. Find the average of first 30 multiples of 8 
   A.) 104
   B.) 124
   C.) 130
   D.) 121

Answer: Option ''

Solution is :
Average of first 30 natural numbers = ( n + 1 ) / 2
= ( 30 + 1 ) / 2
= 31 / 2
15.5
Average of first 30 multiples of 8 = ( Average of first 30 natural numbers ) * 8
= 15.5 × 8
124.
The average of first 30 multiples of 8 = 124.

  • 218. Find the average of first 30 multiples of 8 
   A.) 104
   B.) 124
   C.) 130
   D.) 121

Answer: Option ''

Solution is :
Average of first 30 natural numbers = ( n + 1 ) / 2
= ( 30 + 1 ) / 2
= 31 / 2
15.5
Average of first 30 multiples of 8 = ( Average of first 30 natural numbers ) * 8
= 15.5 × 8
124.
The average of first 30 multiples of 8 = 124.

  • 219. Find the average of first 26 multiples of 11
   A.) 148.5
   B.) 148
   C.) 149
   D.) 149.5

Answer: Option 'A'

Solution is:
Average of first 26 natural numbers = ( n + 1 ) / 2
= ( 26 + 1 ) / 2
= 27 / 5
= 13.5
Average of first 26 multiples of 11 = ( Average of first 26 natural numbers ) × 11
= 13.5 × 11
148.5

  • 220. Find the average of first 26 multiples of 11
   A.) 148.5
   B.) 148
   C.) 149
   D.) 149.5

Answer: Option 'A'

Solution is:
Average of first 26 natural numbers = ( n + 1 ) / 2
= ( 26 + 1 ) / 2
= 27 / 5
= 13.5
Average of first 26 multiples of 11 = ( Average of first 26 natural numbers ) × 11
= 13.5 × 11
148.5

  • 221. The average weight of a class having 12 students is 30 kg. Find the total weight of the class.
   A.) 320
   B.) 360
   C.) 260
   D.) 460

Answer: Option 'B'

Solution is
[ Total quantity = Average x No.of quantity ]

= 12 x 30
360
Answer is 360

  • 222. The average weight of a class having 12 students is 30 kg. Find the total weight of the class.
   A.) 320
   B.) 360
   C.) 260
   D.) 460

Answer: Option 'B'

Solution is
[ Total quantity = Average x No.of quantity ]

= 12 x 30
360
Answer is 360

  • 223. Find the average of the first 70 natural numbers
   A.) 35
   B.) 34.5
   C.) 35.5
   D.) 31.5

Answer: Option 'C'

Solution is
Average of n natural numbers = (n + 1 ) / 2
= ( 70 + 1 ) / 2
= 71 / 2
35.5 
Answer is 35.5

  • 224. Find the average of the first 70 natural numbers
   A.) 35
   B.) 34.5
   C.) 35.5
   D.) 31.5

Answer: Option 'C'

Solution is
Average of n natural numbers = (n + 1 ) / 2
= ( 70 + 1 ) / 2
= 71 / 2
35.5 
Answer is 35.5

  • 225. The average weight of a class having 14 students is 44 kg. Find the total weight of the class.
   A.) 606
   B.) 616
   C.) 626
   D.) 636

Answer: Option 'B'

Solution is
Average = Total Quantity / No. of Quantity
Total quantity = Avg x No. of Quantity

Total quantity = 14 x 44
= 616
Answer is 616

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