Solving word problems

CevaprffYnhevyl
timer Asked: Nov 22nd, 2015

Question Description

A petroleum company has two different sources of crude oil. The first source provides crude oil that is 

70%

 hydrocarbons, and the second one provides crude oil that is 

90%

 hydrocarbons. In order to obtain 

120

 gallons of crude oil that is 

75%

 hydrocarbons, how many gallons of crude oil must be used from each of the two sources? 

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