Hey guys what is this type of equation/ question called 1 < x < 30

I’m not good at math can i have ? ?

Why is partitioning a directed line segment into a ratio of 1: 3 not the same as finding the length of the directed line segment?

Anumber is equal to twice a smaller number plus 3. the same number is equal to twuce the sum of the smaller number and 1. how many solutions are possible for this situation