2.3 oz per bag, so for x bags you have 2.3x oz total.
The total amount is given as 27.6 oz, so you have 27.6=2.3x.
set equation \(27.6=2.3x\)
simplify by dividing both sides by 2.3 \(\frac{27.6}{2.3}=\frac{2.3x}{2.3}\)
solution: \(x=\frac{27.6}{2.3}=12\)