Question 79
A rectangular piece of paper of dimensions $20 \times 19$, divided into unit squares, is cut into several square pieces, the cuttings being made along the sides of the unit squares. Such a square piece is called an *odd square* if the length of its side is an odd number.
a) What is the minimum possible number of odd squares?
b) What is the smallest value which can be taken by the sum of the perimeters of all the odd squares?
a) What is the minimum possible number of odd squares?
b) What is the smallest value which can be taken by the sum of the perimeters of all the odd squares?