Model of how to find quotient 2.4 divided by 3

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

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

Robin spent 25% more time on his research project than he had planned he’s been an extra h ours on the project which of the following expressions could represent the number of hours rob actually spent on the project