a) $$\frac{(x + y)}{(x - y)}$$ b) $$\frac{(x + y)}{2xy}$$ c) $$\frac{2(x + y)}{xy}$$ d) $$\frac{2xy}{(x + y)}$$ Answer: ...
View QuestionThe mean of 5 numbers is 18. If one number is excluded, their mean is 16. Find the excluded number.
a) 25 b) 26 c) 27 d) 28 Answer: b Explanation: Excluded number ...
View QuestionThere were 35 students in a hostel. If the number of the students is increased by 7, then the expenses of the mess increased by Rs. 42 per day, while the average expenditure per head diminishes by Rs. 1. The original expenditure of the mess per day was
a) Rs. 400 b) Rs. 420 c) Rs. 432 d) Rs. 442 Answer: b Explanation: ...
View QuestionA library has an average of 510 visitors on Sundays and 240 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is:
a) 250 b) 276 c) 280 d) 285 Answer: d Explanation: Since the month ...
View QuestionThe average weight of 16 boys in a class is 50.25 kg and that of the remaining 8 boys is 45.15 kg. Find the average weights of all the boys in the class.
a) 47.55 kg. b) 48 kg. c) 48.55 kg. d) 49.25 kg. Answer: c Explanation: $$\eqalign{ ...
View QuestionThe average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is:
a) 17 kg b) 20 kg c) 26 kg d) 31 kg Answer: d Explanation: ...
View QuestionIn Arun’s opinion, his weight is greater than 65 kg but less than 72 kg. His brother doest not agree with Arun and he thinks that Arun’s weight is greater than 60 kg but less than 70 kg. His mother’s view is that his weight cannot be greater than 68 kg. If all are them are correct in their estimation, what is the average of different probable weights of Arun?
a) 67 kg b) 68 kg c) 69 kg d) Data inadequate Answer: a Explanation: ...
View QuestionA car owner buys petrol at Rs.7.50, Rs. 8 and Rs. 8.50 per litre for three successive years. What approximately is the average cost per litre of petrol if he spends Rs. 4000 each year?
a) Rs. 7.98 b) Rs. 8 c) Rs. 8.50 d) Rs. 9 Answer: a Explanation: ...
View QuestionThe average of 12 numbers is 15 and the average of the first two is 14. What is the average of the rest?
a) 15 b) $$15\frac{1}{5}$$ c) 14 d) $$14\frac{1}{5}$$ Answer: b Explanation: Average of 12 numbers = 15 Total ...
View QuestionSix numbers are arranged in decreasing order. The average of the first five numbers is 30 and the average of the last five numbers is 25. The difference of the first and the last numbers is
a) 20 b) 25 c) 5 d) 30 Answer: b Explanation: Numbers are x > y > ...
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