SweetandSour34
SweetandSour34 SweetandSour34
  • 02-05-2018
  • Mathematics
contestada

21 marbles out of N are blue; probability of getting a blue one = 30%

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twvogels
twvogels twvogels
  • 02-05-2018
[tex]Probability=\frac{desired}{total}[/tex]
[tex]0.3=\frac{21}{N}[/tex]
[tex]0.3N=21[/tex]
[tex]N=\frac{21}{0.3}[/tex]
[tex]N=70[/tex]

There are 70 total marbles. 
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