10. A basketball player has a probability of making a two-point shot and a three-point shot of $50\%$ and $40\%$, respectively. The player scored a total of 54 points, and the number of two-point shots attempted was $50\%$ more than the number of three-point shots attempted. How many three-point shots did the player attempt?
(A) 10
(B) 15
(C) 20
(D) 25
(E) 30
10. C.
$$
\begin{array}{l}
\text { Given }\left\{\begin{array}{l}
y=x(1+50 \%), \\
2 y \cdot 50 \%+3 x \cdot 40 \%=54
\end{array}\right. \\
\Rightarrow(x, y)=(20,30) .
\end{array}
$$