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Mathematics 18 Online
OpenStudy (anonymous):

At Trent's garage, 3 cases of brake fluid last 4 weeks. Trent has 5 cases. How much more brake fluid should Trent order so that he has enough for 13 weeks? Round your answer up to the nearest whole number.

OpenStudy (jdoe0001):

\(\large{ \begin{array}{llll} cases&weeks\\ \hline\\ 3&4\\ x&13 \end{array}\implies \cfrac{3}{x}=\cfrac{4}{13}}\)

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