2 years ago

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

Mathematics

1 answer:

MissTica2 years ago

4 0

$Probability=\frac{desired}{total}$
$0.3=\frac{21}{N}$
$0.3N=21$
$N=\frac{21}{0.3}$
$N=70$

There are 70 total marbles.

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