1 litre of petrol cost rupees 67 1/2 find the cost of 7 9/10 litre of petrol
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cost of 1 litre of petrol = rupees 67 1/2
= 135/2
the cost of 7 9/10 litre of petrol = 7 9/10 * 135/2
= 79/10 * 135/2
= 79/2 * 27/2
= 2133/ 4
therefore the cost of 7 9/10 litre of petrol = 2133/ 4
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