30 x 2/5 = <<30*2/5=12>>12 members ordered lemon juice.

So, 30 - 12 = <<30-12=18>>18 members did not order lemon juice.

Since 1/3 of the remaining ordered mango juice, then 18 x 2/3 = <<18*2/3=12>>12 members ordered mango juice.

Therefore, 18 - 12 = <<18-12=6>>6 members ordered orange juice.

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
A club with 30 members ordered fruit juices. Two-fifths of them ordered lemon juice. One-third of the remaining members ordered mango juice, and the rest ordered orange juice. How many members ordered orange juice?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
6
A club with 30 members ordered fruit juices. Two-fifths of them ordered lemon juice. One-third of the remaining members ordered mango juice, and the rest ordered orange juice. How many members ordered orange juice?
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