Aptitude - Average - Discussion
Discussion Forum : Average - General Questions (Q.No. 9)
9.
A 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?
Answer: Option
Explanation:
| Total quantity of petrol consumed in 3 years |
|
||||||||||||
|
|||||||||||||
|
Total amount spent = Rs. (3 x 4000) = Rs. 12000.
 Average cost = Rs. |
 |
12000 x 51 |  |
= Rs. | 6120 | = Rs. 7.98 |
| 76700 | 767 |
Discussion:
93 comments Page 9 of 10.
Santhosh Sandy said:
1 decade ago
In the solution how they got 4000(2/15+1/8+2/17) = (76700/51) ?
I'm bit confused :-(.
I'm bit confused :-(.
Henry said:
1 decade ago
When you say approximately. Is it wise to say the answer is 7.98 instead of 8.0 which is B?
Mounika said:
1 decade ago
Answer: 1503.92.
Harika said:
9 years ago
Nice explanation @Krishna.
Jeevan j said:
1 decade ago
At most one minute is the time available for this question. So further simplifications is required.
Gameruler said:
1 decade ago
How can we calculate this without using the calculator?
Abhishek said:
1 decade ago
Where 51 came from?
Gunwanti said:
1 decade ago
Can any one explain 76700/51?
Ramsreeram said:
1 decade ago
Its simple because answer must be close to 7.98 or 8 here averages so it must be ratio form so 7.98.
Chippey said:
1 decade ago
After taking 4000 as common it is left with.
4000[1/7.50 + 1/8 + 1/8.50].
1/7.50 can be written as 100/750 which is equal to 2/15.
Similarly 1/8.50 can be written as 100/850 which is equal to 2/17.
4000[1/7.50 + 1/8 + 1/8.50].
1/7.50 can be written as 100/750 which is equal to 2/15.
Similarly 1/8.50 can be written as 100/850 which is equal to 2/17.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers