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In order to gain a profit of 10% , in what ratio should a shopkeeper mix two types of rice if he mixes rice worth Rs. 50 per kg and Rs. 55 per kg and selling it at Rs. 58.20 per Kg?
A. 3 : 4
B. 3 : 2
C. 3 : 5
D. 4 : 5

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In what ratio must tea at Rs.9.30 per Kg be mixed with tea at Rs. 10.80 per Kg so that the shopkeeper can sell the mixture worth Rs.10 per Kg?
A. 8 : 7
B. 7 : 8
C. 8 : 9
D. 9 : 8
In a box, there are 8 orange, 7 black and 6 white balls. If one ball is picked up randomly. What is the probability that it is neither orange nor white?
A. 2/3
B. 3/4
C. 7/19
D. 8/21