There are 3 white marbles and 7 blue marbles in a bag. jamie will randomly pick two marbles out of the bag without replacing the first marble chosen. what is the probability of jamie's picking 2 white marbles? a) 1/15 b) 1/18 c) 1/20 d) 1/7

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?