Marty has 100 centimeters of ribbon that he must cut into 4 equal parts. Each of the cut parts must be divided into 5 equal parts. How long will each final cut be?
The 100-centimeter ribbon is cut into 4 equal parts in pieces of 100 / 4 = 
<gadget id="calculator">100/4</gadget>
<output>25</output>
25 cm.
From each piece of 25 cm, he gets 5 equal parts of 25 / 5 = 
<gadget id="calculator">25/5</gadget>
<output>5</output>
5 cm each.

<result>5</result>