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The average of 18\dfrac{1}{8}81 and 16\dfrac{1}{6}61 is
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The average of 18\dfrac{1}{8}81 and 16\dfrac{1}{6}61 is 18+162=324+4242=12×724=748\dfrac{\dfrac{1}{8}+\dfrac{1}{6}}{2} = \dfrac{\dfrac{3}{24}+\dfrac{4}{24}}{2} = \dfrac{1}{2} \times \dfrac{7}{24} = \dfrac{7}{48}281+61=2243+244=21×247=487.
Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project.