Mindy and Troy combined ate 999 pieces of the wedding cake. Mindy ate 333 pieces of cake and Troy had 1/4 of the total cake.

Question

write an equation to determine how many pieces of cake there was in total

 

Answer 1

Mindy and Troy at 999 pieces of cake.  Mindy at 333 so Troy at 666.  If Troy at 1/4 of the cake then 1/4 (x) = 666 where x is the number of pieces of cake.

or 

333 + (1/4)x = 999