Latest Book Aptitude Question SOLUTION: grandpa is writing a book. every morning he starts writing vigorously and fills a lot of pages. but post lunch he goes through all that he's written that far(right from day one) an

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grandpa is writing a book. every morning he starts writing vigorously and fills a lot of pages. but post lunch he goes through all that he's written that far(right from day one) and deletes 1/5th of it. he doesn't write anything more that day. At the end of the day the content of his book is still 20% more than at the end of the previous day. how much percent new content does grandpa write in the morning?

Asked In Book Richa Pandey (8 years ago)

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Devendra Marghade  (8 years ago)

50% more or 150% of previous day.


If he writes 'x' new pages & post lunch deletes 1/5th of it, so remaining=x-(x/5)=4x/5, which is 20% more than the previous day.
As 4x/5 is 120% of the previous day, so 'x' will be 120*x/(4x/5)=150% of the previous day.

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aditi kumari  (8 years ago)

let he write X page on first day.Then at the end of day after deleting --->remaining page = X-(x/5)=4X/5.
Now suppose 2nd day he write Y page,and at the end of day rtemaning page = 4Y/5
According to question 4Y/5=4X/5+ 4X/5*(20/100)=24X/25.
==> Y=6X/5.
%increase= (((6X/5)-X)/X)*100=20%
==>20 %new content.

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