Ms. Cathy bought a package of pens. Out of every 10 ​, pens, 7 are black. If there are 20 pens in the​ pack, what fraction of the pens in the pack are​ black? What percent of the pens in the pack are​ black? What fraction of the Owens in the pack is​ black?

Agroup 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?