Question

The pressure of a 133 ml sample of gas at a constant temperature is decreased from 3.88 atm to 2.96 atm. What is the final volume of the gas?

Answer 1

This concerns Boyle's Law:
P1 * V1 = P2 * V2
V2 = (P1 * V1) / P2
V2 = (3.88 * 133) / 2.96
V2 =  174.3378378378 ml
V2 =  174.34 rounded

Source
http://www.1728.org/boyle.htm