To determine how much oil is left after 35 oil changes, we first need to calculate how much oil has been used.
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Each oil change requires 5 quarts of oil.
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For 35 oil changes, the total amount of oil used is:
\[ 35 \text{ oil changes} \times 5 \text{ quarts per oil change} = 175 \text{ quarts} \]
Next, we need to convert the total amount of oil that was used from quarts to gallons, since the original quantity of oil is in gallons. There are 4 quarts in a gallon.
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To convert quarts to gallons:
\[ 175 \text{ quarts} \div 4 \text{ quarts per gallon} = 43.75 \text{ gallons} \]
Now, we can calculate how much oil is left in the 50-gallon container after the oil changes.
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Subtract the used oil from the total initial amount:
\[ 50 \text{ gallons} - 43.75 \text{ gallons} = 6.25 \text{ gallons} \]
Thus, after 35 oil changes, there are 6.25 gallons of oil left in the 50-gallon container.