A group of girls stood in three rows. The 1st row had 6w girls. The 2nd row had 6w more girls than the 1st row. The 3rd row had 4 less girls than the 2nd row.
- Find the number of girls in the 3rd row in terms of w. Give your answer in the simplest form.
- There were 80 girls in the 3rd row. Find the value of w.