Question

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? Options:

Answer 1

First step:80% of 90 days

Second step:80 *90

=72

Thus,r can alone make the book in 72 days

please mark my answer as brainliest

Answer 2

Let, total no. pages in book be 90. Then S makes daily 1 page.

Now R no. of pages/day= (80/100) x1 = 1.8 page per day.

For 90pages,time R would take= 90/1.8= 50.