A computer printer can print a 660-word document in 35 seconds. At this rate, how many seconds are required to print a document that contains 840 words?

660/35 = 840/x

Cross multiply and solve for x.

To find out how many seconds are required to print a document containing 840 words, we can use a proportion.

First, we need to set up the proportion using the given information:

660 words = 35 seconds
840 words = x seconds

Now we can cross-multiply and solve for x:

660x = 840 * 35

To find x, divide both sides of the equation by 660:

x = (840 * 35) / 660

Simplifying this expression gives us:

x = 44.54545454545455

Therefore, it would take approximately 44.55 seconds to print a document with 840 words at the same rate as the given printer.