I've currently set up a survey that lets a user rate 40 randomly chosen images. The images are chosen from a larger set of 200 with repetition (meaning it is possible for an image to be presented more than once to the same user). What I don't know how to do is to limit the total number of responses on each of these 200 images to 5, i.e. images that reach 5 responses are not shown to users any more.
Is this possible to do?
The randomisation is done by 40 equation questions that generate a random number [1-200]. These 40 numbers are then used in the filenames of the images.