10. (6 points) Using 24 matchsticks of the same length, first use some of them to form 6 triangles on a plane, with each side of the equilateral triangle being one matchstick. Then use the remaining matchsticks to form squares on the plane, with each side of the square being one matchstick. How many such squares can be formed at most? $\qquad$
10. (6 points) Using 24 equally long matchsticks, first use some of them to form 6 triangles on a plane, with each side of the equilateral triangle being one matchstick. Then, use the remaining matchsticks to form squares on the plane, with each side of the square being one matchstick. How many such squares can be formed at most?

【Solution】Solution: Number of matchsticks used for triangles: 6-1=5 (sticks)
$$
3+5 \times 2=13 \text { (sticks) }
$$

Remaining matchsticks:
$$
24-13=11 \text { (sticks) }
$$

Squares:
Two sides of one use three matchsticks, total:
$$
3 \times 2=6 \text { (sticks) }
$$

Remaining:
$11-6=5$ (sticks)
Each in the middle uses 2 matchsticks, there are:
$$
5 \div 2=2 \text { (squares) } \cdots 1 \text { (stick) }
$$

Total squares:
$$
2+2=4 \text { (squares) }
$$

Therefore, the answer is: 4.