SOLUTION: You want to count the number of bacteria in 1ml of solution but there are to many to count. So you mix the 1ml with 9ml of water to dilute it and then draw 1ml of the new mixture.

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Question 911402: You want to count the number of bacteria in 1ml of solution but there are to many to count. So you mix the 1ml with 9ml of water to dilute it and then draw 1ml of the new mixture. Still to many, so you mix with 9ml of water and draw 1ml of new solution and now count 75 bacteria swimming around. How many bacteria was in the original solution?
Found 2 solutions by richwmiller, josgarithmetic:
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.1*.1=1/100
75*100=7500

Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
c is the count of bacteria in the 1 ml. original sample.

Your first dilution made the count to be (1/10)c.

Your second dilution made the count to be (1/10)(1/10)c.

You counted and found highlight_green%28c%2F100=75%29.
Remember, c is how many bacteria were in the original 1 milliliter sample of solution.