Mr. Walker asked his students to use the associative property to find an expression that is equivalent to (13+15+20) + (20+47+18). The expressions that four students created are shown in the table below.

Jerry (20+13+15) + (20+47+18)

Layla (20+47+18) + (13+15+20)

Keith (13+20) + (20+47+18) + 15

Melinda (13+15+20+20) + (47+18)

How many of the students correctly applied only the associative property to rewrite the expression?

one

two

three

four