Answer:
[tex]7:\dfrac{1}{3}=21[/tex] pieces
Step-by-step explanation:
Suppose you have a 7 feet long wood.
You need to find how many [tex]\frac{1}{3}[/tex]-foot pieces can be cut from this wood.
To find this number of pieces, you have to divide the whole length of the wood by the length of one piece:
[tex]7:\dfrac{1}{3}=\dfrac{7}{1}\cdot \dfrac{3}{1}=21[/tex]
