In an examination, 60% passed in English, 50% passed in Maths, and 20% failed in both. If 360 students passed in both, find the total number of students. MCQ with Answer and Explanation
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Question #1
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A shopkeeper sells an article at 10% profit. Had he bought it at 20% less and sold it for Rs. 12 less, he would have gained 25%. The cost price is:
Correct Answer: Option C
Explanation:
CP=x, SP=1.1x. New CP=0.8x, new SP=1.1x-12 = x → 0.1x=12 → x=120.
CP=x, SP=1.1x. New CP=0.8x, new SP=1.1x-12 = x → 0.1x=12 → x=120.
This question belongs to:
Maths
Percentage
Question #2
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A student multiplied a number by 3/5 instead of 5/3. What is the percentage error in the calculation?
Correct Answer: Option C
Explanation:
True value = 5/3x. False value = 3/5x. Error = (5/3 - 3/5)x = (16/15)x. % Error = ((16/15) / (5/3)) * 100 = (16/25) * 100 = 64%.
True value = 5/3x. False value = 3/5x. Error = (5/3 - 3/5)x = (16/15)x. % Error = ((16/15) / (5/3)) * 100 = (16/25) * 100 = 64%.
This question belongs to:
Maths
Percentage
Question #3
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Radius of circle decreased 20%. Area decreases by:
Correct Answer: Option B
Explanation:
Area multiplier = 0.8² = 0.64, decrease 36%.
Area multiplier = 0.8² = 0.64, decrease 36%.
This question belongs to:
Maths
Percentage
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