Answer:
10j yards
Step-by-step explanation:
Xander has 10 pieces of Twine.
Each Piece is j yard long
1 piece = j yards
2 pieces = (j+j) yards = (2 X j) yards of twine
3 pieces = (j+j+j) yards = (3 X j) yards of twine
Therefore:
10 pieces = (10 X j) yards of twine.
Altogether Xander has 10j yards of twine