Help chemistry problem

Question

you have water in two graduated cylinders, one equals 3 mL and the other equals .05 mL. You then add them together into a beaker.

How would you write the number describing the total volume?

What limits the precison of this Number?

Answer 1

(3 + 0.05) mL plus or minus the square root of the sum of squares of both errors of the glasswares as specified in the brand of glassware you are using.

the total volume will always be in this range and governed only by random errors if care is taken in measuring and transfering and preventing evaporation of the water.