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Question

How much tea at Rs. 4 a kg should be added to 15 kg of tea at Rs. 10 per kg so that the mixture be worth Rs. 6.50 a kg?

Solution
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Let x kg of tea be added.

So, 4x+15×10=(x+15)×6.50

4x+150=13x2+15×132

8x+300=13x+195

13x8x=300195

5x=105

x=21

21 kg of tea should be added.

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