Explain how you can use base ten blocks to find 1.54 + 2.37

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.

Anyone know? is appreciated! will mark brainliest if correct!

The sum of two numbers is 12 and their difference is 18 what are the two numbers