Aptitude - Arithmetical Ability

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31.

Find the average of all prime numbers between 30 and 50.?                          
A. 39.8 B. 48.8
C. 59.8 D. 69.8



32.

Find the average of first 40 natural numbers.?                          
A. 72 B. 74
C. 70 D. 76



33.

A pupil's marks were wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half (1/2). The number of pupils in the class is:?                          
A. 10 B. 20
C. 40 D. 73




34.

The average age of P, Q, R and S is 30 years. How old is R?(I). The sum of ages of P and R is 60 years.(II). S is 10 years younger than R.?                          
A. I alone sufficient while II alone not sufficient to answer B. II alone sufficient while I alone not sufficient to answer
C. Either I or II alone sufficient to answer D. Both I and II are not sufficient to answer



35.

The average of five numbers id 27. If one number is excluded,the average becomes 25. The excluded number is?                          
A. 25 B. 27
C. 30 D. 35



36.

The batting average for 40 innings of a cricket palyer is 50 runs. His highest score exceeds his lowest score by 172 runs. If these two innings are excluded, the average of the remaining 38 innings is 48 runs. The highest score of the player is?                          
A. 165 runs B. 170 runs
C. 172 runs D. 174 runs



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