In a multiple choice quiz there are 5 questions and 4 choices for each question (a, b, c, d). robin has not studied for the quiz at all, and decides to randomly guess the answers. what is the probability that (a) the first question she gets right is the 3rd question? (b) she gets exactly 3 or exactly 4 questions right? (c) she gets the majority of the questions right?

He ! a group of farmers planned to clean 80 acres of wheat per day to finish the work on schedule. right before the work started, they received a new piece of machinery that them clean 10 more acres per day than originally planned. as a result of increased productivity in the last day before the deadline they only had to clean 30 acres. how many acres of wheat did the group of farmers have to clean?