Basic exercise in using Instances and picking Instances.
Notice that there is only 1 chest sprite, 1 coin sprite and 1 check sprite. Hence, there is only 1 event / game action, yet it works for all.
https://www.dropbox.com/s/ibwbdgqmx2jn5 ... .capx?dl=0
This principle is the whole big idea behind the Construct 2 engine, and if you ask me, the beauty of it.