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**1. Homework Statement**

A bubble comes from the bottom of the tank of water to the surface and triples in its volume. If the temperature of the tank of water doesnt deppend on the depth what is the depth of the tank that the bubble was at?

**2. Homework Equations**

##PV=nRT##

**3. The Attempt at a Solution**

Since the temperature stays constant i guessed

##P_bV_b=P_uV_u##

##P_bV_b=P_u3V_b##

and i get 30m but the answer states 20m. What is wrong?