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 |
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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 7 of 10.
Saikumar said:
1 decade ago
Thanks krish.
Karuna said:
1 decade ago
Other than this any other simple calculation is there ?
Rabindra gouda said:
1 decade ago
Most simply answer:
Total amount of rupees/total amount of petrol in litre
3yrs total spent petrol in rupees = 3*4000 = 12000 ........(i).
Total amount of petrol spent in 3year = (4000/7.50)+(4000/8)+(4000/8.50)..........(ii).
Equation (i)divided by equation(ii) we get avg rupees spent per petrol
12000/533.3+500+470.5 = 12000/1503.8 = 7.98(answer).
Total amount of rupees/total amount of petrol in litre
3yrs total spent petrol in rupees = 3*4000 = 12000 ........(i).
Total amount of petrol spent in 3year = (4000/7.50)+(4000/8)+(4000/8.50)..........(ii).
Equation (i)divided by equation(ii) we get avg rupees spent per petrol
12000/533.3+500+470.5 = 12000/1503.8 = 7.98(answer).
Bhupesh said:
2 decades ago
I cant understand last calculation that why the reciprocal of the cosumed quatity of the petrol is taken?
Jasmine said:
2 decades ago
Tanks krish. !
Iswarya said:
2 decades ago
Hey thank you krishna that was usful.
Shivapriya said:
2 decades ago
Can anyone explain clearly ?
Prince said:
2 decades ago
It is not clear very much......
Muralidhar reddy said:
2 decades ago
Here how average cost calculated any explain me ?
SriHarsha said:
2 decades ago
Can any 1 xplain it clearly wit simpl logic.
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