How to find the unit's "1" quantity? Let's try to talk about the front or back of what word

How to find the unit's "1" quantity? Let's try to talk about the front or back of what word

It is very important to find the right unit "1"
Who is who
Who is equal to who
Who takes who
Who is better than who
Who refers to the unit "1"
Unit "1" is known. By multiplication, unit 1 × whose share = whose quantity
Unit "1" is unknown and requires division, whose quantity △ whose share = Unit 1