Question 2821
Ratio of gas to oil = 50 : 1
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Quantity of oil = x gallons
Quantity of gas = 20 gallons
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Then using the given ratio,
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50 : 1 = x : 20
By cross mutliplying we get
x=1000 gallons.
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Therefore you need 1000 gallons of oil for 20 gallons of gas.
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Hope this helped,
Best of luck.