A student multiplied a number by 4/5 instead of 5/4. What is the percentage error? MCQ with Answer and Explanation
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Question #1
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If A is 20% less than B, then B is what percentage more than A?
Correct Answer: Option C
Explanation:
Formula: (R / (100 - R)) * 100. Here R = 20. (20 / 80) * 100 = (1 / 4) * 100 = 25%.
Formula: (R / (100 - R)) * 100. Here R = 20. (20 / 80) * 100 = (1 / 4) * 100 = 25%.
This question belongs to:
Maths
Percentage
Question #2
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55% of a number is 33 less than 70% of the same number. The number is:
Correct Answer: Option A
Explanation:
0.7x - 0.55x = 33 → 0.15x = 33 → x = 220.
0.7x - 0.55x = 33 → 0.15x = 33 → x = 220.
This question belongs to:
Maths
Percentage
Question #3
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Population of a city is 1,20,000, increasing at 10% per year. After 1 year, population is:
Correct Answer: Option B
Explanation:
1,20,000 × 1.1 = 1,32,000.
1,20,000 × 1.1 = 1,32,000.
This question belongs to:
Maths
Percentage
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