a computer typist types a page with 20 lines in 10 minutes but he leaves 8% margin on the left side of the page. now he has to type 23 pages with 49 lines on each page which he leaves 25% more margin than before. how much time is now required to type these 23 pages

Asked by ajayrath7 | 26th May, 2017, 07:19: PM

Expert Answer:

begin mathsize 14px style Assuming space every space line space has space 100 space characters space with space 8 percent sign space margin comma
the space total space number space of space characters space written space in space one space line space is space 100 minus 8 space equals space 92.
Time space taken space to space write space 20 space lines space is space 10 space mins.
So comma space time space taken space to space write space 1 space line space with space 92 space characters space is space fraction numerator 10 over denominator 92 cross times 20 end fraction
Now comma space when space the space margin space is space increased space by space 25 percent sign
rightwards double arrow new space margin space is space 8 plus 0.25 cross times 8 equals 10
rightwards double arrow number space of space characters space per space line space now equals 90
Total space number space of space characters space to space be space written
equals number space of space characters space per space line cross times number space of space lines space per space page cross times number space of space pages
equals space 90 cross times 49 cross times 23
Total space time space required
equals total space number space of space characters cross times time space required space to space type space one space character
equals fraction numerator left parenthesis 90 cross times 49 cross times 23 right parenthesis cross times 10 over denominator 92 cross times 20 end fraction equals 551 space minutes space approximately
equals space 9 space hours space left parenthesis approximately right parenthesis end style

Answered by Rebecca Fernandes | 24th Nov, 2017, 12:07: PM