The number of students in 10 kindergarten classes is shown below

20, 18, 21, 18, 22, 24, 18, 23, 23, 24,

What is the median number of students in the kindergarten classes?

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