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प्रश्न
The ratio of boys to girls in a class is 2 : 3. The average weight of boys is 30 kg and the average weight of girls is 28 kg. What is the average weight of the entire class?
पर्याय
29.5 kg
27 kg
28.8 kg
29 kg
MCQ
उत्तर
28.8 kg
Explanation:
Hence, `(30 - x)/(x - 28) = 3/2`
60 – 2x = 3x – 84
144 = 5x and x = 28.8 kg
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Mixture and Allegations (Entrance Exam)
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