Sonny substituted 5 for x in the proportion 16/x=48/15 and cross multiplied to get 240=240. why is this? a. because the cross sums of the proportion are equal b. because the cross differences of the proportion are equal c. because the cross products of the proportion are equal d. because the cross quotients of the proportion are equal

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?