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A variety of rice at 14 per kg is mixed ...

A variety of rice at 14 per kg is mixed to 15 kg of another variety rice at Rs.20 per kg, so as to make a mixture worth Rs. 16.50 per kg. The quantity of rice at Rs. 14 per kg must be

A

5 kg

B

7 kg

C

15 kg

D

21 kg

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