Question

1. Timmy's printer can print 18 pages in 12

minutes.

a. How many pages can it print in 3/4 of an
hour?
b. How about in 1 hour?

Answer 1

A. Timmy's printer can print 68 pages 3/4 of an hour.

B. Timmy's printer can print 90 pages in 1 hour.

Answer 2

Printer can print 90 pages in an hour and 67.5 pages in 45 minutes.

SOLUTION:

Given, Timmy's printer can print 18 pages in 12 minutes.

A ) How many pages can it print in 3/4 of an hour?

3/4 th of an hour = 3/4 x 60 minutes = 45 minutes.

So, we need to find how many pages can be printed in 45 minutes.

Let the number of pages be x.

We know that,

12 minutes → 18 pages

45 minutes → x pages

On applying chris cross method, 12
`*` x = 45
`*` 18

x =
`((45 * 18))/(12)`

`= ((45 * 3))/(2)`

=
`(135)/(2)` = 67.5

So, printer can print 67.5 pages in 45 minutes.

B ) How many pages can it print in an hour?

Let the number of pages be x.

We know that,

12 minutes → 18 pages

60 minutes → x pages

On applying chris cross method, 12
`*` x = 60
`*` 18

x =
`(60 * 18)/(12)`

x = 5
`*` 18 = 90

So, printer can print 90 pages in an hour.