Answer:
It is just right
Explanation:
Kermit's fav = 15 tea bags every 2 liters = 15/2 = 7.5 teabags per liter
Peggy made 90 teabags in 12 liters = 90/12 = 7.5 teabags per leter
Hence peggy used the same teabags per liter than kermit's favorite. It is just right.
edit: calculation error. corrected.