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Algebra word problems

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I am having difficulties with two practice word problems attached. Please help.

Word Problems:
1. The octane rating of a gasoline is a measure of the amount of isooctane in the gas. Subaru recommends 91-octane gasoline for the 2008 Legacy 3.0 R. How much 87-octane gas and 93-octane gas should Kelsey mix in order to make 12 gal of 91-octane gas for her Legacy?

2. A university bookstore recently sold a wirebound graph-paper notebook for $3.36 and a college-ruled notebook for $4.57. At the start of spring semester, combinations of 50 of these notebooks were sold for a total of $205.51. How many of each type were sold?

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This solution provides a guide to solving the given algebra word problems.

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Word Problems:
1. The octane rating of a gasoline is a measure of the amount of isooctane in the gas. Subaru recommends 91-octane gasoline for the 2008 Legacy 3.0 R. How much 87-octane gas and 93-octane gas should ...

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