A petroleum company has two different sources of crude oil. The first source provides 40% crude 50+2?

A petroleum company has two different sources of crude oil. The first source provides crude oil that is 40% hydrocarbons, and the second one provides crude oil that is 65% hydrocarbons. In order to obtain gallons of crude oil that is 50% hydrocarbons, how many gallons of crude oil must be used from each of the two sources?
A petroleum company has two different sources of crude oil. The first source provides crude oil that is 40% hydrocarbons, and the second one provides crude oil that is 65% hydrocarbons. In order to obtain 170 gallons of crude oil that is 50% hydrocarbons, how many gallons of crude oil must be used from each of the two sources?

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