Which of the following statements is false if a number is a natural number then it is rational if a number is a integer then it is a rational if a number is a whole number than it is rational if a number is a fraction that is rational

Arectangular lawn is 14m long and 10m wide. a strip of uniform width is mowed around the outside of the lawn. how wide is the strip when the area of the unmowed portion of the lawn is 12m². (the answer is 4m, but i need to know how to solve it)