Mr. Morrison and Ms. Johnson are teaching their classes how to write in cursive. Mr. Morrison has already taught his class 12 letters. The students in Ms. Johnson's class, who started the unit later, currently know how to write 7 letters. Mr. Morrison plans to teach his class 2 new letters per week, and Ms. Johnson intends to cover 3 new letters per week. Eventually, the students in both classes will know how to write the same number of letters. How long will that take? How many letters will the students know?

In
weeks, the students in both classes will know how to write
letters in cursive.