Question

A man can type 20 lines in 10 minutes but he leaves 8% margin in each line. In how much time he will type 23 pages with 40 lines on each page leaving 25% more margin than before​

Answer 1

Step-by-step explanation:

1 page, 20 lines, 8% margin, 10 minutes

Of those 20 lines, 8% of the total is blank margin, so the actual amount typed is

100

92

×20=18.4 lines in 10 minutes, or about 1.8 lines per minute.

23 pages, 40 lines, 25% more margin

To figure out new margin, we simply take the previous amount and add 25% to it:

100

125

×8=10 percent margins.

Using this, we know that 10% of each line is blank, so for 40 lines, the amount typed is 40×

100

90

=36 lines. At a rate of 1.8 lines per minute, each page will take 20 minutes.

All 23 pages will take 23×20=460 minutes. Divide by 60 to get to hours and you get

60

460

=7

3

2

hours.

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