Percentage : Aptitude Test | RRB Group D

  • Percentage
  • 41. Out of the first 75 natural numbers, what percentage of them have 7 either in the units place or the tens place? 
   A.) 18.33%
   B.) 17.33%
   C.) 16.33%
   D.) 13.33%

Answer: Option 'B'

There are 13 numbers.
(7, 17, 27, 37, 47, 57, 67, 70, 71, 72, 73, 74, 75) * 100 = 17.33%

  • 42. The population of a town was 1,00,000 three years ago. If increased by 2%, 3% and 5% respectively in the last three years, then the present population of town is
   A.) 1,11,111
   B.) 1,10,101
   C.) 1,10,313
   D.) 1,11,125

Answer: Option 'C'

The present population = (102/100) × (103/100) × (105/100) × 100000 = 1,10,313

  • 43. In an election, the winning candidate got 58% of the valid votes. If he got 1600 votes more than the other candidate and 100 votes were invalid, find the number of votes cast.
   A.) 13500
   B.) 15150
   C.) 10109
   D.) 10100

Answer: Option 'D'

Let the number of valid votes be x
Winning candidate - 58% of x
Other candidate - 42% of x 
Difference - 16% of x
16% of x = 1600
x = 10000
Total votes = 10000  + 100 = 10100

  • 44. Ganesh scored 93% in his exams. If he scored 84 marks less than the maximum marks. Find the maximum marks
   A.) 1000
   B.) 1200
   C.) 1400
   D.) 1500

Answer: Option 'B'

He scored 7% less than the maximum marks.
7% of x = 84 x = 1200

  • 45. Two students appeared at an examination. One of them secured 9 marks more than the other and his marks was 56% of the sum of their marks. The marks obtained by them are:
   A.) 39, 33
   B.) 41, 33
   C.) 42, 33
   D.) 43, 33

Answer: Option 'C'

Let their marks be (x + 9) and x.
Then, x + 9 = (56/100)(x+9+x)
25(x+9) = 14(2x + 9)
3x = 99
x = 33
So, their marks are 42 and 33.