15 psi
Step-by-step explanation:
P₁V₁ = P₂V₂
We replace the variable with values given in the question;
12 psi * 5 L = P₂ * 4 L
12 * 5 / 4 = P₂
60 / 4 = P₂
15 = P₂
The pressure that will result in a volume of 4 is 15 psi
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