What was one reason that china lost the sino japanese war

If you mean the first one, corruption was one reason. The Chinese navy and military were incredibly corrupt (as was the government) -- funds meant to buy ships and ammunition were often embezzled by officers for other uses. Pay in the army was low, morale was low, compared to the Japanese military which was also modernized but based on Western principles and proven tactics.

I'm not 100 percent sure i say 7 is your answers