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- TL;DR Summary
- Different people like to or are forced to choose variables and some do not. I wonder if this is a matter of style or how a person was taught.

When people graduate and have their degrees in engineering or physics or mathematics or what they may have done, some of these people will use some mathematics, very often which is some-what complicated (or not) arithmetic. Why will some people choose to strictly avoid using variables in the numeric problems they solve? Why would these people not choose variables for what they are looking for? Further, why so rarely anyone give variables to all numbers involved in a problem situation (assuming only rational or linear or maybe quadratic relationships) and solve for what is wanted, all in variables like to have a formula as a result; and then to use that formula for any example which fits the situation? Seems strange to me that a person would go through their courses Algebra 1 through Calc&AnalyticGeometry 3, several different science or engineering courses, and then later when on the job never use some variables to solve some multi-step numeric problems. Did anybody of the group recall like in first learning Physics: Assign variables to everything, and then solve all in variables, and to substitute the values last?