According to Avagadro’s law when the temperature and pressure remain constant on which factor does the volume of gas depend?

If the temperature and pressure are kept constant how can we in crease the volume?

If the numbers of moles of a gas are doubled by leeping the temperature and pressure constant. What will happen to the volume.

If the number of moles of a gas are doubled by keeping the temperature and pressure constant, what will happen to the volume.

If the pressure of a certain amount of a gas is doubled keeping the temperature constant, what would be the volume of, the gas?

At what temperature will the pressure of a gas at 0^(@)C doubles itself when volume remains constant?