Translations:Expression Manager examples/21/en
From LimeSurvey Manual
The Equation Question Type can be used to store something in the database. You can do something with an Expression, show the Equation question (which is similar to a text display) and store the result of the Expression in the database. It stores the answer into the responses table. Then, the result can be used within the statistics feature or it can also be imported into one of the formats provided by the LimeSurvey export functionality.