FACTS  AND  FORMULAE  FOR  AVERAGE QUESTIONS

 

 

1. Average =Sum of observationsNo. of observations

2. Suppose a man covers a certain distance x kmph and an equal distance at y kmph. Then, the average speed during the whole journey is2xyx+yKmph

Q:

A canteen requires 56 kgs of rice for seven days . The quantity of rice required for the months of April and May together is

A) 468 kg B) 488 kg
C) 498 kg D) 508 kg
 
Answer & Explanation Answer: B) 488 kg

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Q:

In a class of 60 students there are 33 girls. The average weight of these girls is 62 Kg and average weight of the full class is 66.5 kg. What is the average weight of the boys of the class?

A) 72 kg B) 71 kg
C) 70 kg D) 73 kg
 
Answer & Explanation Answer: A) 72 kg

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Q:

The average age of 120 members of a society is 60.7 years. By addition of 30 new members, the average age becomes 56.3 years. What is the average age (in years) of newly joined members?

A) 36.5 B) 37.2
C) 38.3 D) 38.7
 
Answer & Explanation Answer: D) 38.7

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Q:

What is the average of all natural numbers from 21 to 39?

A) 30 B) 31
C) 29 D) 28
 
Answer & Explanation Answer: A) 30

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Q:

An engineering student has to secure 45% marks to pass. He gets 54 and fails by 36 marks. Find the maximum marks.

A) 200 marks B) 225 marks
C) 250 marks D) 275 marks
 
Answer & Explanation Answer: A) 200 marks

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Q:

The average of three numbers is 40. First number is 4/3 of the third number. If third number is 20 less than second number, then what is the value of second number?

A) 60 B) 50
C) 10 D) 20
 
Answer & Explanation Answer: B) 50

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Q:

What is the average of all numbers between 100 and 200 which are divisible by 13?

A) 147.5 B) 145.5
C) 143.5 D) 149.5
 
Answer & Explanation Answer: D) 149.5

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Q:

In a class of 66 students there are 33 girls. The average weight of these girls is 61 Kg and average weight of the full class is 66 kgs. What is the average weight of the boys of the class?

A) 72 B) 73
C) 69 D) 71
 
Answer & Explanation Answer: D) 71

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