Question

James types 84 words in 2 minutes. He estimates that his history essay is 420 words long. What is the least amount of time James will need to type his essay?

Answer 1

`"10 min"`

Explanation:

`"84 words = 2 minutes"`

So

`"42 words = 1 minute"`

Then

`"420 words" xx ("1 min")/("42 words") ="10 minutes"`

Answer 2

`10` minutes.

Explanation:

If James can write `84` words in `2` minutes, then he writes `84/2` words/minute, or `42`. Since `420` is `42xx10`, he can write `420` words in `10` minutes.