Answer to this week's riddle

Travis Hale

Again, the riddle:

A logger makes five deliveries of logs to a mill. The unique sums of the ten pairs of bundles of logs are: 80 tons, 82 tons, 83 tons, 84 tons, 85 tons, 86 tons, 87 tons, 88 tons, 90 tons, and 91 tons. How much does each bundle weigh?

Answer: 39 tons; 41 tons; 43 tons; 44 tons; 47 tons.