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Lucinda is a cross-county ski racer. On Saturday she skied twice as many miles as she did on Sunday. Over the weekend she skied a total of 63 miles. How far did she ski on each day?

 Jan 22, 2020
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Lucinda is a cross-county ski racer. On Saturday she skied twice as many miles as she did on Sunday.
Over the weekend she skied a total of 63 miles. How far did she ski on each day?

 

\(\text{Let Saturday $= x$ } \\ \text{Let Sunday $= y$ } \)

 

\(\begin{array}{|rcll|} \hline \mathbf{x + y} &=& \mathbf{63~miles} \\ y &=& 63 - x \\\\ \mathbf{x} &=& \mathbf{2y} \\ x &=& 2(63 - x) \\ x &=& 126 - 2x \\ 3x &=& 126 \quad | \quad : 3 \\ \mathbf{x} &=& \mathbf{42~miles} \\\\ y &=& 63 - x \\\\ y &=& 63 - 42 \\ \mathbf{y} &=& \mathbf{21~miles} \\ \hline \end{array}\)


On Saturday she skied \(\mathbf{42~miles}\)
On Sunday she skied \(\mathbf{21~miles}\)

 

laugh

 Jan 22, 2020

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