Answer:64.389
Step-by-step explanationthe new volume in each cylinder will be the volume of water + volume 1 cube (assuming the cubes does not float on water)
then volume of a cube =side^3=(2.90 cm)^3= 24.389cm^3=24.389mL
(considering that 1 ml= 1 cm^3)
Finally the new level of each cylinder is=40 mL+24.389mL=64.389 mL
(if the cube float we need to consider the volume under water (with densities which are not given)