AMC 10 Step by Step
2011 AMC 10BProblem 5P1-10~2 minPrint

In multiplying two positive integers aa and bb , Ron reversed the digits of the two-digit number aa . His erroneous product was 161161 . What is the correct value of the product of aa and bb ?

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site.