Lakshya Education MCQs

Question:  the average of six numbers is x and the average of three of these is y. if the average of the remaining three is z, then :
Options:
A.x = y + z
B.2x = y + z
C.3x = 2y - 2z
D.none of these
Answer: Option B
Explanation :

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Question 1.  in a village the average age of n people is 42 years. but after the verification it was found that the age of a person had been considered 20 years less than the actual age, so the new average, after
  1.    21
  2.    20
  3.    22
  4.    None of these
Answer: Option B
Explanation :
Question 2.  a motorist travels to a place 150 km away at an average speed of 50 km/hr and returns at 30 km/hr. his average speed for the whole journey in km/hr is :
  1.    35
  2.    36
  3.    37.5
  4.    38.2
Answer: Option C
Explanation :
Question 3.  in a village the average age of n people is 42 years. but after the verification it was found that the age of a person had been considered 20 years less than the actual age, so the new average, after
  1.    21
  2.    20
  3.    22
  4.    None of these
Answer: Option B
Explanation :
Question 4.  of the following, which is greater than ½ ?
  1.    2/5
  2.    4/7
  3.    4/9
  4.    5/11
Answer: Option B
Explanation :
Question 5.  the average value of property of mittal, ambani and singhania is rs.11111 crore. the property of singhania is as less than the property of mittal is greater than the average property of both the singh
  1.    Rs.111 crore
  2.    Rs. 1111 crore
  3.    Rs. 11111 crore
  4.    can't be determined
Answer: Option C
Explanation :
Question 6.  the average age of the boys in a class is 16 years and that of the girls is 15 years. the average age for the whole class is :
  1.    15
  2.    20
  3.    21
  4.    data inadequate
Answer: Option D
Explanation :

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