The new pressure 1.76 atm
Explanation:
P₁V₁/T₁ = P₂V₂/T₂
Since the temperature of the system remains constant, then we can cancel out the T₁ and T₂ to remain with;
P₁V₁ = P₂V₂
We replace the values given in the question. The unknown will be P₂
2.76 * 10 = P₂ * 15
27.6 /15 = P₂
1.76 = P₂
= 1.76 atm