Multiple choice

In 2007 the ratio of prices of mustard oil and Refined oil were in the ratio of 6:5. In 2008 the price of mustard oil is four times of itself and the price of Refined oil is increased by Rs. 100, then the new ratio of prices of the same oil becomes 4:5. What was the original price of the Refined oil in 2007?

  1. Rs.40

  2. Rs.20

  3. Rs.50

  4. Rs.30

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let 2007 prices be 6x (mustard) and 5x (refined). In 2008: mustard = 4(6x) = 24x, refined = 5x + 100. New ratio 24x:(5x + 100) = 4:5. Cross-multiplying: 120x = 20x + 400, so 100x = 400, giving x = 4. Original refined price = 5(4) = Rs. 20.

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