The cost of petrol rises by 15 paise a litre every week. Last week a man bought 20 litres at the
old price. This week he bought 10 litres at the new price. Altogether, the petrol costs
₹2101.5 /-. Find the price of 1 litre petrol of last week. [15 paisa = ₹0.15 ]
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the old price of petrol was 70
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