选择题
2020 AMC 8 Problem 13: Purple Socks
Jamal has a drawer containing 6 green socks, 18 purple socks, and 12 orange socks. After adding more purple socks, Jamal noticed that there is now a 60% chance that a sock randomly selected from the drawer is purple. How many purple socks did Jamal add?
2020 AMC 8 第 13 题：紫色袜子
Jamal 有一个抽屉，里面有 6 只绿色袜子、18 只紫色袜子和 12 只橙色袜子。添加更多紫色袜子后，贾马尔注意到现在有 60% 的机会从抽屉中随机选择一只袜子是紫色的。贾马尔添加了多少双紫色袜子
A.
6
B.
9
C.
12
D.
18
E.
24