If you are asking what one serving size in cups of brown rice is the answer is 1/2 cup.
If there are 40 servings per container of rice and 20 cups you would simply divide
Einthovens's Triangle is an imaginary lead formation for EKG. Developed by William Eithoven, the leads are placed on wrists of both arms and the lower left leg. This forms a equilateral "triangle" for which to measure Electrocardiogram readings.