1st 16 more than a number is three times the number.
2nd three times a number is 1 more than twice the number.（write an equation and find the unknown value）

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field

Which number line correctly shows 0.8 + 0.3?

Can someone show me step by step how to do this?