7. (10 points) Xiao Yangyang and a group of little sheep cut a pile of green grass to eat during the winter. They calculated that on average, each little sheep cut 45 kilograms. If, in addition to themselves, they also give a share to Village Chief Man Yangyang, then each little sheep can get 36 kilograms. When they returned to the village, Lan Yangyang came over and also wanted a share. In this case, each little sheep can only get $\qquad$ kilograms of grass.

保留源文本的换行和格式，直接输出翻译结果如下：

7. (10 points) Xiao Yangyang and a group of little sheep cut a pile of green grass to eat during the winter. They calculated that on average, each little sheep cut 45 kilograms. If, in addition to themselves, they also give a share to Village Chief Man Yangyang, then each little sheep can get 36 kilograms. When they returned to the village, Lan Yangyang came over and also wanted a share. In this case, each little sheep can only get $\qquad$ kilograms of grass.
【Solution】Let the number of lambs mowing grass be $x$, then they mow a total of $45 x$ kilograms of grass,
$$
\begin{array}{l}
45 x=36(x+1) \\
45 x=36 x+36 \\
9 x=36 \\
x=4 \\
45 \times 4 \div(4+1+1) \\
=180 \div 6 \\
=30 \text { (kilograms) }
\end{array}
$$

Answer: In this way, each lamb can only get 30 kilograms of grass.
Therefore, the answer is: 30.