Kehley D. answered • 06/08/16

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Hi Jessica,

From the question, we know:

Q+N=68

and

Q(0.25)+N(0.05)=8.40

We can rearrange the first equation to solve for Q so that we get:

Q=68-N

We can then substitute 68-N in for Q in the second equation:

(68-N)(0.25)+N(0.05)=8.40

Solve for N, then plug its value into the first equation to solve for Q.