Please help !! does anyone know this?? ​

2-digit numbers less than 91 which are 1 less than a multiple of 10

Neveah and clint are baking muffins for the bake sale. they need to bake 30 muffins for their display case. clint has baked 4 so far, and neveah has baked 7. how many muffins (m) do they have left to bake? show your work!

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?