What is 21/4 in simplest form

Find the solution of system of equation y= x-4 y=4x+2

Adam drew two same size rectangles and divided them into the same number of equal parts. he shaded 1/3 of one rectangle and 1/4 of the other rectangle. what is the least number of parts into which both rectangles could be divided into?

If olu is twice as old as funmi if the sum of their ages is 60 how old is olu