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    Question

    After decreases in petrol prices by 20%, a person is

    able to buy 3 litre more petrol for Rs. 540. Find the original and increased price of petrol per litre.
    A Rs. 40 & Rs.32 Correct Answer Incorrect Answer
    B Rs. 42 & Rs.35 Correct Answer Incorrect Answer
    C Rs. 45 & Rs.36 Correct Answer Incorrect Answer
    D Rs. 45 & Rs. 30 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Sol: Let the original price(O.P.) be Rs. X per kg. New price(N.P.) = 80% of x = Rs. 4x/5per kg. Quantity of petrol the person could buy at original price = 540/xltr. Quantity of petrol he can buy at new price = ltr. =675/x-540/x 3 = 135/x= 3 ⇒ 3 = 135 ⇒ = 45 O.P. = Rs.45 and N.P. = Rs. 4x/5= 4*45/5= Rs.36

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