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jmc

number theory junior

Problem

How many positive two-digit integers leave a remainder of 2 when divided by 8?
Solution
Our goal is to count the two-digit integers in the form for integer values of . We examine the inequality, Subtracting 2 from all parts simplifies things: Dividing everything by 8 isolates the possible values of : Since can be any integer from 1 to 12, there are two-digit integers in the form (that leave a remainder of 2 when divided by 8).
Final answer
12