Question 1108823
I thought to do the same calculation as the other tutor, but notice that one dimension of the large block is 75cm, and that the cubes to be carved  have sides equal to 10cm.  So 10cm will divide evenly into 70cm but not 75cm.   Therefore, we can say {{{ N >= 140}}}.  I did not have the time (or method) to check if there is a geometric arrangement of the carvings that allows for a few more cubes to be carved but certainly {{{ N < 150 }}}, no?