Solution dilution

I'm further diluting a solution which has previously been diluted. I started with a 1:4 dilution, then diluted that a further 1:5, what is my dilution factor after this?

Correct answer:

r =  1:20

Step-by-step explanation:

r1=1:4=0.25 r2=1:5=0.2  r=r1 r2=0.25 0.2=0.05=1:20

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