1.

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?1). 652). 603). 504). 70

Answer»

Let efficiency of S be 100

Thus, Efficiency of R = 100 × 180/100 = 180

Ratio of their efficiency R : S = 180 : 100 = 9 : 5

If S alone can make a book in 90 DAYS,

So, Total work = 90 × 5 = 450

∴ R alone can COMPLETE the book = 450/9 = 50 days


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