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Part of 2019 Math Prize for Girls Problems

Problems(1)

Math Prize 2019 Problem 1

Source:

In the USA, standard letter-size paper is 8.5 inches wide and 11 inches long. What is the largest integer that cannot be written as a sum of a whole number (possibly zero) of 8.5's and a whole number (possibly zero) of 11's?

Math Prize for Girls