Quantitative Aptitude
AVERAGES MCQs
Averages
Total Questions : 3752
| Page 9 of 376 pages
Answer: Option D. -> 45
 - Let the fourth number be a
Then, third number = 5a, second number = 5a 3 And first number = 10a 3 x + 5x + 5x 3 + 10x 3 = (24.75 x 4) or 11x = 99 or x = 9. So, the numbers are 9, 45, 15 and 30
Largest number = 45
 - Let the fourth number be a
Then, third number = 5a, second number = 5a 3 And first number = 10a 3 x + 5x + 5x 3 + 10x 3 = (24.75 x 4) or 11x = 99 or x = 9. So, the numbers are 9, 45, 15 and 30
Largest number = 45
Answer: Option B. -> 4.6
 - Sum of the remaining two numbers = (3.95 x 6) – [(3.4 x 2) + (3.85 x 2)]
= 23.70 - (6.8 + 7.7) = 23.70 - 14.5 = 9.20
Average = 9.2/2 = 4.6
 - Sum of the remaining two numbers = (3.95 x 6) – [(3.4 x 2) + (3.85 x 2)]
= 23.70 - (6.8 + 7.7) = 23.70 - 14.5 = 9.20
Average = 9.2/2 = 4.6
Answer: Option B. -> 2 : 3
 - Let the ratio be k:1
Then, k x 16.4 + 1 x 15.4 = (k + 1) x 15.8
(16.4 - 15.8) k = (15.8 - 15.4)
k = 0.4 = 2 0.6 3
Required Ratio =2 : 3
 - Let the ratio be k:1
Then, k x 16.4 + 1 x 15.4 = (k + 1) x 15.8
(16.4 - 15.8) k = (15.8 - 15.4)
k = 0.4 = 2 0.6 3
Required Ratio =2 : 3
Answer: Option D. -> Data inadequate
 - Clearly, to find the average, we ought to know the number of boys, girls or students in the class, neither of which has been given
So, the data provided is inadequate
 - Clearly, to find the average, we ought to know the number of boys, girls or students in the class, neither of which has been given
So, the data provided is inadequate
Answer: Option A. -> Rs 10 and Rs 16
 - Total price of the two books = Rs. [(12 x 10) – (11.75 x 8)]
= Rs. (120 - 94) = Rs. 26
Let the price of one book be Rs.x
Then, the price of other book = Rs. (x + 60% of x) = x + 3 5 x = Rs. 8x 5
So, x + 8x 5 = 26
 - Total price of the two books = Rs. [(12 x 10) – (11.75 x 8)]
= Rs. (120 - 94) = Rs. 26
Let the price of one book be Rs.x
Then, the price of other book = Rs. (x + 60% of x) = x + 3 5 x = Rs. 8x 5
So, x + 8x 5 = 26
Answer: Option A. -> 7.98
 - Quantity of petrol consumed in 3 years = 4000 7.50 + 4000 8 + 4000 8.50 litres = 4000 ( 2 15 + 1 8 + 2 17 ) = 76700 51 litres Total amount spent = Rs. (3 x 4000) = Rs. 12000. Average cost =. 12000 x 51 76700 = Rs. 6120 767 = Rs. 7.98
 - Quantity of petrol consumed in 3 years = 4000 7.50 + 4000 8 + 4000 8.50 litres = 4000 ( 2 15 + 1 8 + 2 17 ) = 76700 51 litres Total amount spent = Rs. (3 x 4000) = Rs. 12000. Average cost =. 12000 x 51 76700 = Rs. 6120 767 = Rs. 7.98
Answer: Option A. -> 6979515
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Answer: Option C. -> 470
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Answer: Option C. -> 59.1
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Answer: Option D. -> 14 years 8 months
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