calculate the surface tension of organic liquid.

Water and an organic liquid, two different stalogmometer is used. water and organic liquid at test temperature their densities are 0.998x10^3 respectively kg/m3 and 0.755x10^3 kg/m3 is. water at the same temperature the surface tension is 0.07275 N/m. Radius of stalogmometer used for water 0.011 mm drop number 100; radius of stalogmometer used for organic liquid 0.019 mm and the number of drops is 280. According to these results, calculate the surface tension of the organic liquid.