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?
Rs. 7.98
Rs. 8
Rs. 8.50
Rs. 9
Answer: Option
Explanation:

Total quantity of petrol
consumed in 3 years
= 4000 + 4000 + 4000  litres
7.50 8 8.50
= 4000 2 + 1 + 2  litres
15 8 17
= 76700  litres
51

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 6 of 10.

SriHarsha said:   2 decades ago
Can any 1 xplain it clearly wit simpl logic.

Akashay said:   10 years ago
Is there any shortcut to solve this problem?

Jeevan said:   9 years ago
Nice, thanks for the explanation @Arvind.

Longanathan said:   1 decade ago
Thanks Krish, that was simple and sound.

Jyoti said:   4 years ago
Thank you for explaining @Arvind Sahu.
(3)

Swapn said:   9 years ago
It's a difficult calculation done here

Iswarya said:   2 decades ago
Hey thank you krishna that was usful.

Nitin said:   1 decade ago
Thnks krishna your result is so easy.

Pratik said:   9 years ago
Thanks for the given explanations.

Swaroopa said:   1 decade ago
Thank you all for the explanation.


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