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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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Item 5 There are 20 balls in a bag. Ten of the balls are red, 4 are green, and the rest are yellow. Which ratio represents the n
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3:5 <em>the colon is needed to represent the ratio</em>

Step-by-step explanation:

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so ratio of total balls is 10:4:6

and ratio of y:r is

6:10

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4 0
2 years ago
I am confusion <br><br> Solve: -3x = 15 *
Greeley [361]
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7 0
3 years ago
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Mr.rodriguez invests half money in land a tenth in stocks and a twentieth in bonds he puts the remaining 35,000 in his savings a
Elena-2011 [213]

Answer:  $100,000

<u>Step-by-step explanation:</u>

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    \dfrac{1}{2}x    +    0.1x     +    \dfrac{1}{20}x       +  35,000   =  1.00x  

=  0.5x   +     0.1x   +     0.05x  +  35,000  =  1.00x

=                                    0.65x  +  35,000  =  1.00x

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                                                     \dfrac{35,000}{0.35}=\dfrac{0.35x}{0.35}

                                                    100,000  =  x  

3 0
3 years ago
Read 2 more answers
Simplify,write equivalent expressions. 1/6(15a+20b)
lutik1710 [3]
1/6* (15a+20b)
= 1/6* 15a + 1/6* 20b (Distributive property)
= 2.5a + 10/3*b

The final answer is 2.5a+ 10/3b

Hope this helps~
6 0
3 years ago
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