Help on number four plzzz

2 answers:

4 0

4=3
5=4
6=2
7=5
8=6
9=4
10= 16
16=31
18=36

4 0

1st board is 2, 5ft pieces
2nd board is 2, 6ft pieces and 1, 4ft piece
3rd board is 2, 5 ft piece and 2, 4ft piece split it like that

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