Question 1178422
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The response from tutor @MathLover1 is absurd -- unless the spherical balls are silly putty or some similar infinitely malleable material.<br>
Assuming the spheres remain as spheres when packed into the box, the dimensions of the box and the diameter of the spheres make the array of balls 4 by 2 by 2, for a total of 4*2*2=16 balls.<br>
The amount of free space in the box is then the volume of the box, minus the volume of 16 spheres of diameter 1.5 cm.<br>