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:
92 comments Page 2 of 10.
Surya said:
4 years ago
Thanks @Krishna.
Shivna said:
4 years ago
Thank you @M.V Krishna.
(1)
Sneha said:
4 years ago
= 4000( 100/750) + (1/8) + (100/850).
= 4000(2/15+1/8+2/17) cross multiplication,
= 4000(31/120+2/17) Cross mul,
= 4000(767/2040),
= 3068000/2040 decided by 4 on both side,
= 76700/51.
= 4000(2/15+1/8+2/17) cross multiplication,
= 4000(31/120+2/17) Cross mul,
= 4000(767/2040),
= 3068000/2040 decided by 4 on both side,
= 76700/51.
(2)
Mansingh budha said:
4 years ago
I do not understand this problem. How can I solve it? please solve it again.
(1)
Sagar said:
5 years ago
Thanks @Krishna.
Sunil yadav said:
5 years ago
Thanks @Krishna.
Sai said:
5 years ago
Thanks @Krishna.
Karthik said:
5 years ago
You are correct, Thanks @Krishna.
Krishna said:
6 years ago
See at last everyone is asking why they have taken reciprocal. The answer is that in the question itself they asked what is the average cost per liter. So we have to find the cost of the amount of petrol not petrol at cost.
Mohamed alfaan mirsha said:
6 years ago
I am not getting this, Can anyone explain me in detail?
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers