Total number of the adults are 693
Percentage of adults that show that they erase all of their personal information online is 58%
Geberal expression for the percentage is

We need to find the number of adults that erase all of their personal information online.

Substitute the value
Let x=Number of adults who erase thier personal information

Simplify and solve for, x

Round of the x value

Number of adults who erase thier personal information are 402.