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Mrs. Marks can do 25 pushups in 80 seconds. How many pushups can she do in 135 seconds
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Mrs. Marks can do 25 pushups in 80 seconds. How many pushups can she do in 135 seconds

User Thor Samsberg
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\begin{array}{ccll} pushups&seconds\\ \cline{1-2} 25 & 80\\ x& 135 \end{array} \implies \cfrac{25}{x}~~=~~\cfrac{80}{135} \\\\\\ \cfrac{25}{x}=\cfrac{16}{27}\implies 675=16x\implies \cfrac{675}{16}=x\implies 42\approx x

User Andrew Corkery
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