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:

Mahesh buys 3 shirts at an average price of Rs 1250. If he buys 2 more shirts at an average price of Rs 1450 what will be the average price (in Rs) of all the 5 shirts he buys?

A) 1370 B) 1330
C) 1310 D) 1390
 
Answer & Explanation Answer: B) 1330

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Q:

Each member of a club contributes as much rupees and as much paise as the number of members of the club. If the total contribution is Rs. 2525, then the number of members of the club is

A) 60 B) 45
C) 55 D) 50
 
Answer & Explanation Answer: D) 50

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Q:

The average cost of 4 items in a shopping list is Rs 1,250. If one more item whose cost is Rs 2,000 is added to the list what will be the new average (in
Rs)?

A) 1100 B) 1500
C) 1400 D) 1250
 
Answer & Explanation Answer: C) 1400

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Q:

The average weight of Shivshankar, Gopesh and Reena is 97 kg. If the average weight of Shivshankar and Gopesh is 93 kg and that of Gopesh and Reena is 82 kg, then the weight of Gopesh is

A) 72 B) 56
C) 59 D) 63
 
Answer & Explanation Answer: C) 59

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Q:

The average of 15 numbers is 7. If the average of the first 8 numbers is 6.5 and the average of the last 8 numbers is 8.5 then middle number is

A) 10 B) 23
C) 13 D) 15
 
Answer & Explanation Answer: D) 15

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Q:

A batsman has a certain average of runs for 12 innings. In the 13th inning he scores 96 runs thereby increasing his average by 5 runs. What will be his average after 13th inning?

A) 28 B) 32
C) 36 D) 42
 
Answer & Explanation Answer: C) 36

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Q:

Of the four numbers whose average is 91, the first is 3/10 times the sum of other three. The first number is:

A) 126 B) 56
C) 168 D) 84
 
Answer & Explanation Answer: D) 84

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Q:

Average of all even numbers between 222 and 250 is __________.

A) 234 B) 232
C) 236 D) 230
 
Answer & Explanation Answer: C) 236

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