Jena mixed 8 lb of raisins that cost 2.50 per lb with nuts that cost 3.75 per lb to obtain a mixture that costs 3.35 per lb.

Let the number of pounds of nuts used by Jena be X. As the cost of the final mixture is 3.35 per lb, the cost of the mixture is 3.35*(X + 8)

3.35*(X + 8) = 2.5*8 + X*3.75

=> X*(3.75 - 3.35) = 26.8 - 20

=> X = 6.8/0.4

=> X = 17

**Jena used 17 pounds of nuts to make the mixture.**

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