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

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02-05-2018
Mathematics

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

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twvogels twvogels · Answer 1 · 2018-05-02T23:54:53+02:00

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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