Write the number 3.3855 times 10 with 2exponent in standard notation

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?

Need solving this 2nd limit problem.

Maria solved an equation as shown below. what is the solution to maria’s equation?