Ratio of two numbers 5:7. First increased 10%, second 20%. New ratio: MCQ with Answer and Explanation
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Question #1
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Two alloys have copper 70% and 40%. Mixed to get 55% copper. Ratio of mixing:
Correct Answer: Option C
Explanation:
Alligation: (70-55):(55-40) = 15:15 = 1:1.
Alligation: (70-55):(55-40) = 15:15 = 1:1.
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Maths
Percentage
Question #2
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Spends 15% rent, 10% food, 20% education, 25% others, saves Rs. 15000. Salary:
Correct Answer: Option D
Explanation:
Total spend 70%, save 30% = 15000, salary = 15000/0.3 = 50000.
Total spend 70%, save 30% = 15000, salary = 15000/0.3 = 50000.
This question belongs to:
Maths
Percentage
Question #3
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40% failed in Physics, 30% in Chemistry, 20% in both. % passed in both:
Correct Answer: Option B
Explanation:
Failed at least one = 40+30-20=50%, passed both = 50%.
Failed at least one = 40+30-20=50%, passed both = 50%.
This question belongs to:
Maths
Percentage
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