If you have 3.15 pieces of chocolate and you give 1.6 pieces to your friend how many pieces of chocolate do you have left?

Each of the walls of a room with square dimensions has been built with two pieces of sheetrock, a smaller one and a larger one. the length of all the smaller ones is the same and is stored in the variable small. similarly, the length of all the larger ones is the same and is stored in the variable large. write a single expression whose value is the total area of this room. do not use any method invocations.

Somone me i want to know what 18 hours out of 24 hours in a fraction

With number 11 ( show how you got the answer)