Evaluate
\frac{19}{40}=0.475
Factor
\frac{19}{2 ^ {3} \cdot 5} = 0.475
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\frac{190}{400}
Subtract 450 from 640 to get 190.
\frac{19}{40}
Reduce the fraction \frac{190}{400} to lowest terms by extracting and canceling out 10.
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