oceangirl9344 oceangirl9344

21-03-2019
Mathematics

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You estimate you can do 12 math problems in 45 minutes. How long should it take you to do 20 math problems?

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jdoe0001 jdoe0001

21-03-2019

[tex]\bf \begin{array}{ccll} problems&minutes\\ \cline{1-2} 12&45\\ 20&x \end{array}\implies \cfrac{12}{20}=\cfrac{45}{x}\implies \cfrac{3}{5}=\cfrac{45}{x}\implies 3x=225 \\\\\\ x=\cfrac{225}{3}\implies x=75[/tex]

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