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While ascending a mountain, a car go 8 k...

While ascending a mountain, a car go 8 kilometre consuming one litre of petrol and during the descending , it can go 12 kilometres consuming one litre of petrol. How many kilometers the car will go in a average per litre of petrol after ascending and then descending the mountain ?

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CALCUTTA BOOK HOUSE-MEASURES OF CENTRAL TENDENCY-EXERCISE
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