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General Aptitude
7.1 Average - General Questions

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Q.

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?

View Answer

Correct choice: A

Explanation:

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

Total amount spent = Rs. (3 x 4000) = Rs. 12000.

Average cost = Rs. (12000 x 51)/76700 = Rs. 6120/767    = Rs. 7.98
   
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