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

1 Answer
Aug 31, 2016

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"#