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Question:  the average of class in 35 yr. 6 new students with an average age of 33 yr. joined in that class, there by decreasing the average by half year. the original strength of the class was
Options:
A.11
B.15
C.18
D.21
Answer: Option C
Explanation :

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Question 1.  the mean weight of 34 students of a school is 42 kg. if the weight of the teacher be included the mean rises by 400g. find the weight of the teacher?
  1.    55 kg
  2.    56 kg
  3.    57 kg
  4.    58 kg
Answer: Option B
Explanation :
Question 2.  the average weight of 21 boys was recorded as 64kg. if the weight of the teacher was added, the average increased by one kg. what was the teacher's weight?
  1.    80 kg
  2.    82 kg
  3.    84 kg
  4.    86 kg
Answer: Option D
Explanation :
Question 3.  the average age of 14 girls and their teacher's age is 15 yr. if teacher's age is excluded then the average reduced by 1. what is the teacher's age?
  1.    27 years
  2.    28 years
  3.    29 years
  4.    30 years
Answer: Option C
Explanation :
Question 4.  the average age of 14 girls and their teacher's age is 15 yr. if teacher's age is excluded then the average reduced by 1. what is the teacher's age?
  1.    27 years
  2.    28 years
  3.    29 years
  4.    30 years
Answer: Option C
Explanation :
Question 5.  the average of 10 number is calculate as 15. it is discovered later on that while calculating the average one number , namely 36 was wrongly read as 26. the correct average is ?
  1.    16
  2.    17
  3.    18
  4.    19
Answer: Option A
Explanation :
Question 6.  the average weight of 21 boys was recorded as 64kg. if the weight of the teacher was added, the average increased by one kg. what was the teacher's weight?
  1.    80 kg
  2.    82 kg
  3.    84 kg
  4.    86 kg
Answer: Option D
Explanation :

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