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The ratio of foam to cotton (by weight) in a mattress of 27 kg is 2 : 7. Find the price of cotton in the mattress if cotton is available at a price of 40 rupees per kg.

The ratio of foam to cotton (by weight) in a mattress of 27 kg is 2 : 7. Find the price of cotton in the mattress if cotton is available at a price of 40 rupees per kg. Correct Answer 840 rupees

Let the weights of cotton and foam be in terms of x. The weight of cotton = 7x and the weight of cotton is 2x. The total weight = 9x = 27 kg X = 3 kg The weight of cotton = 7x = 21 kg The price of cotton = 40 rupees / kg The price of cotton in the mattress = 21 * 40 = 840 rupees

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