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In order to encourage his son in the study of arithmetic, a father agrees to pay him 8 pennies for every problem solved correctly and to charge him 5 pennies for each incorrect solution. After the son completed 26 problems, neither owed anything to the other. How many problems did the son solve correctly?
Clavius' Algebra 1608
Click here to reveal the answer"Why it Pays to Learn Math," Loci (June 2008)