IB ACIO Grade II practice question
The work efficiencies of A, B and C are in the ratio 2:3:5. Working together, they can complete a project in 10 days. All three work together for the first 4 days, after which A and B leave, and C completes the remaining work alone. How many more days does C take to finish the work?
From a IB ACIO Grade II Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (B) 12 days
Combined rate=1/10. In 4 days, work done=4/10=2/5, leaving 3/5. Efficiency ratio 2:3:5 sums to 10 parts, matching combined rate 1/10, so C's rate = 5 parts = 5/100=1/20. Time for C to finish remaining 3/5 = (3/5)÷(1/20) = (3/5)×20 = 12 days.
हिंदी में प्रश्न
A, B और C की कार्यकुशलता का अनुपात 2:3:5 है। साथ काम करने पर, वे एक परियोजना 10 दिन में पूरी कर सकते हैं। तीनों पहले 4 दिन साथ काम करते हैं, जिसके बाद A और B चले जाते हैं, और C शेष कार्य अकेले पूरा करता है। C को कार्य पूरा करने में कितने और दिन लगेंगे?
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सही उत्तर: (B) 12 days
संयुक्त दर=1/10। 4 दिनों में, किया गया कार्य=4/10=2/5, शेष 3/5। कार्यकुशलता अनुपात 2:3:5 का योग 10 भाग है, जो संयुक्त दर 1/10 से मेल खाता है, अतः C की दर = 5 भाग = 5/100=1/20। शेष 3/5 पूरा करने में C को समय = (3/5)÷(1/20) = (3/5)×20 = 12 दिन।
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