When viewed under a light microscope, the size of the cell in the diagram was 20 mm. The magnification of the image was x400. What is the actual size of the cell and give your answer in um (micrometres)? Algebra Linear Equations Equations with Ratios and Proportions 1 Answer Samyak S. · Stefan V. Mar 8, 2017 Answer: #"Actual length" = "measured size" / "magnification"# Explanation: #"Actual length" = "measured size" / "magnification"# So, #"20 mm"/400 = "0.05mm"# Since #"1 mm" = 1000# #mu"m"# The actual size #= 50# #mu"m"# Related questions What is the difference between proportions and ratios? What is the difference between ratios and rates? What are cross products? How do you write "12 meters to 4 floors" as a rate? How do you write and simplify "150 boys to 175 girls" as a ratio? How do you solve #\frac{6}{19} = \frac{x}{11}#? How do you solve #\frac{n+1}{11} = -2#? How do you solve #\frac{0.1}{1.01} = \frac{1.9}{x}#? How do you use proportions to solve how much money the restaurant made if it serves 250 people per ... How do you solve #x/4-7=13#? See all questions in Equations with Ratios and Proportions Impact of this question 663 views around the world You can reuse this answer Creative Commons License