In photography, composition is the way of how elements are arranged to create the best shot. A good composition contributes to a nice photography. One example is street photography. In the streets, you can't control objects based on how you want them to be positioned. Instead, you anticipate for the objects to move in the exact spot on where you wanted them to be.
Two half notes.
Four quarter notes.
Eight eighth notes.
Sixteen sixteenth notes.
Thirty two thirty second notes.
This is all in the 4/4 time usually given in a written score.
Hope this helps.
The expression would look like 2x=5 and your value for x is 5/2 or 2.5
