Question

A computer printer can print a 840-word document in 20 seconds. At this rate, how many seconds are required to print a document that contains 930 words?

Answer 1

930w(20s/840w)=155s/7

155s/7≈22.14 seconds (to nearest hundredth of a second)

Answer 2

You can use the equation 840/20=930/x and then cross-multiply to get 18600=840x. Then just divide both sides by 840 to get 22.14