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How much water should be added to 175 litre of milk at Rs. 8.00 litre so as to have a mixture worth Rs. 7.00 per litre?

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How much wheat at Rs. 4 per kg should be mixed with 42 kg of wheat at Rs. 6 per kg so as to have a mixture worth Rs. 4.80 a kg?
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By mixing two qualities of pulses in the ratio 2:3 and selling the mixture at the rate of Rs. 22 per kg, a shopkeeper makes a profit of 10%. If the cost of smaller quantity be Rs. 14 per kg, the cost per kg of the larger quantity is: