Architecture Puzzler #157

When dried from green to oven-dry, a 1-inch by 8-inch by 10-foot (25- by 200- by 3000-millimeter) board will shrink by different proportions in thickness, width, and length. Match the percentage of shrinkage to the dimension it applies to.

(t) thickness
(w) width
(l) length

a. 5 to 10 percent
b. 0.1 to 0.2 percent
c. 2 to 5 percent

Is steel in older existing structures weldable?