Question
A shopkeeper bought 'x - 30' kg of rice at Rs. 60 per kg
and 30 kg of rice at Rs. 'x' per kg and mixed them. He sold the mixture at Rs. 90 per kg and thus making a profit of 20%. Find the value of 'x'.Solution
Cost price of one kg of mixture = (90/1.20) = Rs. 75 ATQ, [{60 X (x - 30) + (30 X x)}/(x - 30 + 30)] = 75 Or, 60x - 1800 + 30x = 75x Or, 15x = 1800 So, x = 120
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