AP Chem problem! Please help! About barometers and gas laws

[etherealsolvent]

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an open ended mercury barometer has a height of 205 mm with the injection of a gas at 565 mmhg. The liquid in the arm, which is exposed to the air, has a height of 45 mm at the same temperature. What is the atmospheric pressure in torr?
Thank you in advance for all responses 🙂