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:

Average of all even numbers between 104 and 148 is __________.

A) 128 B) 130
C) 124 D) 126
 
Answer & Explanation Answer: D) 126

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Q:

The average of fruits offered in a temple in a week was 75. The average of fruits offered in six days excluding Tuesday was 72. How many fruits were offered on Tuesday?

A) 90 B) 93
C) 72 D) 92
 
Answer & Explanation Answer: B) 93

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Q:

In a class of 39 students there are 26 girls. The average weight of these girls is 42 Kgs and average weight of the full class is 48 kgs. What is the average weight (in kgs) of the boys of the class?

A) 54 B) 66
C) 60 D) 62
 
Answer & Explanation Answer: C) 60

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Q:

Rita buys 5 sarees at an average cost of Rs 2250. If she buys three more sarees at an average cost of Rs 2750, what will be the average (in Rs) of all the sarees she buys?

A) 2437.5 B) 2500
C) 2450 D) 2332.5
 
Answer & Explanation Answer: A) 2437.5

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Q:

Two students appeared for an examination. One of them secured 21 marks more than the other and his marks were 80% of the sum of their marks. The marks obtained by them are

A) 88 and 67 B) 89 and 68
C) 28 and 7 D) 98 and 77
 
Answer & Explanation Answer: C) 28 and 7

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Q:

The average weight of P, Q and R is 45 kg. If the average weight of P and Q be 36.5 kg and that of Q and R be 52 kg, then what is the weight (in kgs) of Q?

A) 42 B) 44
C) 46 D) 48
 
Answer & Explanation Answer: A) 42

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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:

In a marriage party 32% are women, 54% are men and there are 196 children. How many men are there in the marriage party?

A) 756 B) 448
C) 332 D) 324
 
Answer & Explanation Answer: A) 756

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