Answer:
There are <u>40 students</u> in total in the recycling club.
Step-by-step explanation:
Let the total number of students in the recycle club be 'x'.
Given:
Percent of students as 6th graders = 45% of 'x'
Number of students as 6th graders = 18
Now, as per question:
45% of total students = 18
Therefore, there are 40 students in total in the recycling club.