Viscosity of Sugar: Calculating Avogadro# & Molecule Size

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hi, this is the first time i learn about viscosity, but I don't know where to start with this question:
At 18.5°C, the viscosity of 1 wt% aqueous sugar solution is 1.025 times higher than the viscosity of pure water. At the same temperature, the diffusion coefficient of the sugar molecules is 3.82×10-6cm2/sec and the molecular weight is 342.30. Determine the Avogadro number and the size of the sugar molecule.
if you know any good website, please show me :)
 
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Do you have any thoughts or ideas?

Hint: Einstein, 1905
 
a good hint, thank you very much !
 

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