I have been struggling with this for a while I have an equation question that is always visible, including the answer to the equation. reading the manual it seems to suggest that equation questions will be hidden, so I am obviously doing something wrong. Is anyone able to point out where I have made my mistake?

All the logic works in the survey but the equation question that works out the age and stores it is also visible which it should not be. I also think that there is a neater way of doing this but I will leave that until I can hide the equation question.