Production increased from 4000 to 5000. Percentage increase: MCQ with Answer and Explanation
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Question #1
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In an examination, 80% passed in English, 70% in Mathematics, and 10% failed in both. If 144 students passed in both, total students:
Correct Answer: Option B
Explanation:
Failed English=20%, Maths=30%. Passed both = 100 - (20+30-10) = 60%. 60% = 144 → total=240.
Failed English=20%, Maths=30%. Passed both = 100 - (20+30-10) = 60%. 60% = 144 → total=240.
This question belongs to:
Maths
Percentage
Question #2
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A train 250 m long passes a man running at 5 kmph in the same direction in which the train is going, in 10 seconds. Find the speed of the train.
Correct Answer: Option B
Explanation:
Relative speed = (250/10) m/s = 25 m/s = 90 kmph. Speed of train = relative speed + man's speed = 90 + 5 = 95 kmph. (Man running same direction, so train overtakes, relative speed = train speed - man speed). So train speed = 25 m/s + 5 kmph? 25 m/s = 90 kmph, man 5 kmph, so train 95 kmph. Yes.
Relative speed = (250/10) m/s = 25 m/s = 90 kmph. Speed of train = relative speed + man's speed = 90 + 5 = 95 kmph. (Man running same direction, so train overtakes, relative speed = train speed - man speed). So train speed = 25 m/s + 5 kmph? 25 m/s = 90 kmph, man 5 kmph, so train 95 kmph. Yes.
This question belongs to:
Maths
Percentage
Question #3
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If 25% of a number is subtracted from 30% of the same number, the result is 15. Find the number.
Correct Answer: Option B
Explanation:
0.3x - 0.25x = 0.05x = 15 → x = 300.
0.3x - 0.25x = 0.05x = 15 → x = 300.
This question belongs to:
Maths
Percentage
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