Arithmetical Reasoning Questions And Answers

Q-51. The average of 6 numbers is 40. If each of the first three numbers is increased by 4 and each of the remaining three numbers is decreased by 6, then the new average is ? (a) 36 (b) 30
(c) 39 (d) 42

View Answer and Solution 
  
Answer: (c)
Solution:
Sum of the six numbers
= 6 × 40 = 240
Change in the sum of six numbers
= (3 x 4 ) – (3 × 6 )
= 12 - 18 = 6
New average
= 234/6
=39

Q-52. The age of Ram is double as that of Shyam and half as that of Suresh. If the sum of their ages is 70, what is the age of Ram?

(a) 20 (b) 30
(c) 40 (d) 10

View Answer and Solution 
  
Answer: (a)
Solution:
Suppose the age of Shyam
= F years
Age of Ram = 2F years
Age of Suresh = 4F years
According to question,
F + 2F + 4F = 70
or, 7F = 70
F= 70/7 = 10
Age of Ram = 2F
= 2 × 10
= 20 years

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