It need not be, and often is not.
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The sum of an odd number of odd numbers is an odd number. 9 odd parts can't add up to 60.
you can't, unless the area was an odd number you can't, unless the area was an odd number
Yes 97 is an odd number. It's actually something you should know by head already.
odd
An odd number times an odd number is an odd number no matter which 2 odds you multiply.