Find the time needed for culture to contain 90% fibroblasts

When the size of opening of the iris diaphragm is reduced
May 2, 2020
Carbohydrates oxidized to the mitochodria
May 2, 2020

Find the time needed for culture to contain 90% fibroblasts

Equal numbers of fibroblasts and endothelial cells are present initially in a culture.
a. If endothelial cells double every 40 hours and fibroblasts double every 20 hours, draw a graph showing the percentage of cells in the culture that are fibroblasts as a function of time.
b. What is the time required for the culture to contain 90% fibroblasts? Write an equation that describes this situation and, when solved for time, will provide the correct answer.