What would the volume of the balloon be if the temperature increased to 358 K?
You would need to know the initial volume and the initial temperature to solve that question.
If the volume of gas in the balloon remains constant, then an increase in temperature would result in an increased gas pressure in a balloon. That result can be achieved in three ways: 1). Pump more gas into the balloon. or 2). Heat the balloon. or 3). Surround the balloon completely with something and squish it down into a smaller volume. The volume is increased.
== == According to Charles's Law, "At constant pressure, the volume of a given mass of an ideal gas increases or decreases by the same factor as its temperature (in Kelvin) increases or decreases." Therefore, if the temperature of the gas is decreased, the volume of the gas will decrease proportionally, and the balloon will contract.