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:
92 comments Page 3 of 10.
Akash said:
1 decade ago
Look the in the option two closet answer can be 8 or 7.98.
So either can be true but 8 is not possible because of it is not linear so answer will be 7.98.
So either can be true but 8 is not possible because of it is not linear so answer will be 7.98.
Mass said:
7 years ago
Here, the Question should be what is the average cost he spent per litre of petrol if he spends 4000 each year? Not the average cost of petrol?
Sri said:
1 decade ago
Can't understand last calculation that why the reciprocal of the consumed quantity of the petrol is taken?
(1)
Bhupesh said:
1 decade ago
I cant understand last calculation that why the reciprocal of the cosumed quatity of the petrol is taken?
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.
Jeevan j said:
10 years ago
At most one minute is the time available for this question. So further simplifications is required.
Henry said:
10 years ago
When you say approximately. Is it wise to say the answer is 7.98 instead of 8.0 which is B?
D Trimurtulu said:
9 years ago
I did not understand this way. Any other way to simplify this problem? Please explain me.
Mani said:
8 years ago
Answer is very simple when cost is equal in all year, the unit of cost should be average.
Santhosh Sandy said:
9 years ago
In the solution how they got 4000(2/15+1/8+2/17) = (76700/51) ?
I'm bit confused :-(.
I'm bit confused :-(.
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