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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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Mr. Baker has strip of 48- inch long  oak, by this strip he is making the rectangle box of width 14-inch.

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The rectangle is 4 sided geometric shapes whose opposites are equal in lengths and all angles are about 90°.

As Mr. Baker has a strip that is 48-inch long and he made a rectangle box with it.

The width of the  box = 14 inches
now the length of the box = (total length of the strip - 2* width of the box)/2
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