Question

Dorothy types 120 words per minute. How many words does Dorothy type in 1.75 minutes?

Answer 1

210 words.

Explanation:

Firstly note that `1.75=1 3/4` as a mixed number.

and that `1 3/4=7/4" as an improper fraction."`

`rArr(120" words")/(1"min")=(x" words")/(7/4"min")`

and `color(blue)"cross-multiplying"` gives.

`x=120xx7/4=cancel(120)^(30)xx7/cancel(4)^1=30xx7`

`=210" words"`