First we have to find the number of gum she chewed in a day. To do this divide 112 and 14. We got 8. Then multiply the number of gum she chewed in a day (8) by the number of days (20).
If Jenni get one page closer to Wren every night and Wren has read 8 more pages then is will take Jenni 8 more nights to catch up to Wren. They will be on page 30 in their book.