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

426.

A man spends Rs. 1600 per month on an average for the first three months, Rs 1550 for next four months and Rs. 1800 per month for the last five months and saves Rs . 5200 a year. What is his average monthly income?

   A.) Rs. 2050
   B.) Rs. 2100
   C.) Rs. 1950
   D.) Rs. 2200

Answer: Option 'B'

Total expenditure for the first 3 months = 3 × 1600 = 4800
Total expenditure for 4 months = 4 × 1550 = 6200
Total expenditure for 5 months = 5 × 1800 = 9000
Total expenditure and saving (which is income for one year)
= 4800 + 6200 + 9000 + 5200 = Rs. 25200
So, Average monthly income = 25200/12  =  Rs. 2100

427.

In the first 35 overs of a cricket game, the run rate was only 6.4. What should be the run rate in the remaining 15 overs to reach the target of 410 runs?

   A.) 12.4
   B.) 13.4
   C.) 15.25
   D.) 17.25

Answer: Option 'A'

Required Run rate = ( 410 - ( 6.4 x 35 ) )/ (15) 
= ( 186) /(15) = 12.4

428.

There were 17 students in a particular Class. The class teacher knows the overall height of all the students in the class is 1300. Can you find the average height of students in the class?

   A.) 72.65
   B.) 80.29
   C.) 84.12
   D.) 76.47

Answer: Option 'D'

Use the below formula to find the average height of students in the class Average Height = ( Total Height of all students in the Class / Total Number of Students) Average Height = ( 1300/17) = 76.47

429.

Find the sum of first 50 Odd Natural number.

   A.) 2500
   B.) 2400
   C.) 2550
   D.) 2600

Answer: Option 'A'

Sum of Consecutive Odd Numbers:
If N = number of odd terms then sum = (N)2
Here, N = 50
Then, sum of first 50 Odd Natural number = (50)22500.

430.

Total Marks obtained by a class is 1152 and the average score of the class is 72. Find the Total students in the class? 

   A.) 17
   B.) 15
   C.) 16
   D.) 14

Answer: Option 'C'

Use the below formula to find the Total, when Average and Total No. of Students is provided
Total no. of students = Total Marks / Average Marks
Total No. of students = (1152 / 72) = 16

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