Whats the final volume of a gas with an initial volume of 75 mL if the pressure decreases from 300 mL to 200mL

300 ml ... 200 ml

75 ml ... x = ?

If you would like to know what is the final volume of a gas, you can calculate this using the following steps:

300 * x = 200 * 75 / 300

x = 200 * 75 / 300

x = 50 ml

The correct result would be 50 ml.