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

Algebra

210 words.

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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”##