Section A has 45 students with an average score of 60. When combined with section B, whose average is 75, the overall average becomes 66. How many students are in section B?
Correct answer B. 30
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See allTea costing Rs. 210 per kg is mixed with tea costing Rs. 270 per kg in the ratio 2 : 1. What is the cost price of the mixture per kg?
Correct answer B. Rs. 230
A 40 kg salt solution contains 15% salt. How much water must be evaporated so that the solution contains 20% salt?
Correct answer D. 10 kg
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A milkman sells a mixture of milk and water at the cost price of pure milk and gains 20%. In what ratio has he mixed water with milk?
Correct answer C. 1:5
In what ratio must a shopkeeper mix rice costing Rs. 48 per kg with rice costing Rs. 63 per kg to obtain a mixture worth Rs. 54 per kg?
Correct answer C. 3:2
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