Answer
9; 6
Work Step by Step
Tupak is willing to pay 19 but only has to pay 10, so has a surplus of 9.
Thurl is willing to pay 16 but only has to pay 10, so has a surplus of 6.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.