You are given a math word problem and you are supposed to apply a single mathematical operator like addition, subtraction, multiplication, or division on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

rangers from flora natural park and wildlife reserve also joined the activities on that day . they planted 75 redwood trees and 25 cypress trees to replace the trees that were destroyed during a recent forest fire . how many trees did the rangers plant ?
100