Answer:
Glenn can cut 30 pieces
Explanation:
I dekameter =10 metres
If she has 3 pieces that are 1 dekameter long each,
The total length in metres of the ribbons=3X10 metres
If the pieces needed to make the ribbon chains are 1 metre long each
Number of ribbons Glenn can cut =Total Length of ribbon/Length needed for each ribbon key chain
=30/1 = 30 pieces