DHS 2022 Grade-4 Lakhimpur Medical College
#5830
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41. Simplify: 3 + 6 − 3 × 5 + 5
Answer: 0
Detailed Explanation
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Apply multiplication first: 3 + 6 − 15 + 5 = 9 − 15 + 5 = −1. None of the listed options matches; the printed options may contain an error.
#5831
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42. If potatoes cost ₹40 per kg, what is the cost of 3½ kg?
Answer: ₹140
Detailed Explanation
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Cost = ₹40 × 3.5 kg = ₹140.
#5832
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43. Subtract 2.33 from 70.333 and choose the correct answer.
Answer: 68.003
Detailed Explanation
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70.333 − 2.330 = 68.003, which is option B.
#5833
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44. In a school there are 1000 students, 40% of which are girls. What is the number of girls?
Answer: 400
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40% of 1000 = 0.40 × 1000 = 400 girls.
#5834
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45. One person can consume 150 g of rice. If 120 people are invited to lunch, how much rice will be required?
Answer: 18 kg
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Total rice = 150 g × 120 = 18,000 g = 18 kg.
#5835
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46. Divide 300 by 37.5 and choose the correct answer.
Answer: 8
Detailed Explanation
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300 ÷ 37.5 = 8.
#5836
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47. If 3 men can complete a job in 1 day, how many days will 1 man require to complete the job?
Answer: 3
Detailed Explanation
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Assuming equal work rates, total work is 3 man-days. One man would need 3 days.
#5837
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48. Which one of the following numbers is a perfect square?
Answer: 81
Detailed Explanation
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81 = 9², so 81 is a perfect square.
#5838
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49. A sum of ₹15,000 is borrowed at 10% per annum simple interest for 2 years. What is the interest?
Answer: ₹3,000
Detailed Explanation
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Simple interest = PRT/100 = 15,000 × 10 × 2 / 100 = ₹3,000.
#5839
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50. A train moves at 90 km/hour. How far will it travel in 20 minutes?
Answer: 30 km
Detailed Explanation
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20 minutes = 1/3 hour. Distance = 90 × 1/3 = 30 km.
