Answer:
6 
Explanation:
Given ratio: 1:5
Total number of marbles = 36 
Consider, number of Transparent marbles = 1x
number of green marbles = 5x
So,
1x + 5x = 36
6x = 36 
x = 36/6 
x = 6
So, the number of transparent marbles is: 
1x = 1 x 6 = 6 transparent marbles.