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Aliun [14]
3 years ago
6

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

Mathematics
1 answer:
MissTica3 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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