Q. R is 80% more efficient than S. If S alone can make a book in 90 days, then R alone can make the book in how many days?
A) 60
B) 65
C) 70
D) 50
โ Correct Answer: 50
Exam Insight
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A) 60
B) 65
C) 70
D) 50
โ Correct Answer: 50
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