Math question please help asap

Amuffin recipe, which yields 12 muffins, calls for cup of milk for every 1 cups of flour. the same recipe calls for cup of coconut for every cup of chopped apple. to yield a batch of 30 muffins, how much flour will be needed in the mix?

If g^-1(x) is the inverse of g (x) which statement must be true

3.4a=57.8 what is the the value of a