# Constant sum

The constant sum answer type allows the respondent to chose a value that should match the [question constant sum total](https://docs.ngsurvey.com/form-management/form-designer/questions/question-types/advanced-types/untitled).

![](https://1025048312-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M8fLhS0bmfBRyq0HdUm%2F-MBzKBJPsExf7MrRPzCK%2F-MBzKN5llCXPZz-IOR_F%2Fimage.png?alt=media\&token=6bc49e1a-b3fb-41ee-b858-5da1c9c51f5c)