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Biology a level help

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Help I don’t get how to do this… the correct answer is 2000 as it’s says on the paper but I don’t get how.
I got 2000000
I did:
10:90 (10+90=100)IMG_2662.jpegbasically this q^
(edited 1 year ago)
Can you show the full question please?
Original post by humble heroics
Can you show the full question please?

It’s work out the original number of bacteria in the sample
Each dilution is 1:10 so working backwards: 2 x 10 = 20 (1st dilution), 20 x 10 = 200 (2nd dilution), 200 x 10 = 2000 (3rd dilution)
Original post by humble heroics
Each dilution is 1:10 so working backwards: 2 x 10 = 20 (1st dilution), 20 x 10 = 200 (2nd dilution), 200 x 10 = 2000 (3rd dilution)


Ahh so that ratio we cancel down ok thanksss

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