Edited by Scott Stull, [email protected], EducAide Software, Richmond, CA 94806; associate editors Debra Kerr, State College Area School District, Tyrone, PA 16686, and Jane Lataille, Windsor, CT 06095-1775Problems 1–9, 11, 13, 14, and 16–19 were submitted by Richard Evans and Judy Buck, Plymouth State College, Plymouth, NH 03264. Problems 10, 12, 15, and 20–30 came from Elaine Simmt's and Florence Glanfield's Mathematics Majors and Minors, University of Alberta, Edmonton, AB T6G 2E8. Problem 31 was contributed by Dipendra Bhattacharya, Clarion University of Pennsylvania, Clarion, PA 16214-1232. Problems 9 and 11 were published in “Brain Bogglers,” by Michael Stueben, in the July 1987 issue and the January 1985 issue, respectively, of Discover magazine.