10. (12 points) 11 gardeners go to plant trees, 2 of them go to plant trees on Street $A$, and the remaining 9 go to plant trees on Street $B$. In the evening, after work, they return to their dormitory.  
Gardener A says: "Although we are fewer, we took the same amount of time as you."  
Gardener B says: "Although we are more, the length of our street is 5 times the length of your street."  
If the intervals between the trees they plant are the same and each person plants the same number of trees, and they only plant on one side of the street and at both ends of the street; then, these 11 gardeners planted $\qquad$ trees in total.
【Solution】Let the number of trees planted by each person be $x$, then the number of trees planted on Street $B$ is $9 x-1$, and the number of trees planted on Street $A$ is $(2 x-1)$.
$$
\begin{array}{c}
9 x-1=5 \times(2 x-1) \\
9 x-1=10 x-5 \\
10 x-9 x=5-1 \\
x=4 \\
4 \times 11=44 \text { (trees) }
\end{array}
$$

Answer: These 11 gardeners planted a total of 44 trees.
Therefore, the answer is: 44.