A piece of wood is 85 m long. If it was cut into three pieces, and two of the pieces are 25 m, what’s the length of the 3rd piece?

m

The 1st piece: 25 m

The 2nd piece: 25 m

The 3rd piece: 85 m – 25 m – 25 m = 35 m

So the answer is 35 m.