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charle [14.2K]
3 years ago
9

A jar contains 10 red marbles and 20 blue marbles. if one red marble is selected and then placed back into the jar, what is the

probability of the next marble being a blue marble?
Mathematics
1 answer:
Serggg [28]3 years ago
6 0
You have a 30% chance of getting a blue marble. <span />
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Courtney is twice as old as Andre and three years older than Natalie. Courtney is half Shari's age. The difference between Shari
lesantik [10]

The question does not seem complete, but I'll represent the statement mathematically and look for their ages each. This is because the worst they can ask for is their ages.

Let C stand for Courtney's age, A for Andrei's age, N for Natalie's age and S for Shari's age. From the question we can deduce the following:

C = 2A

C = N + 3

C = S/2

S - N = C + A

S = 2C, N = C - 3 and A = C/2, therefore we have

2C - (C - 3) = C + C/2

C + 3 = C + C/2

C/2 = 3 and C = 6

A = C/2

A= 6/2

A = 3

N = C - 3

N = 6 - 3

N = 3

S = 2C

S = 2 x 6

S = 12.

C = 6, A = 3, N = 3 and S = 12

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2 years ago
PLS HELPP <br>pls answer all! pls show work <br>​
ICE Princess25 [194]

Answer: middle one = 4/4 + 1 + 2 =3

Step-by-step explanation:

4/4 also equals one so x=4    1+2=3

4/4=1  

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3.4 - 2/3 > x

2) simplify 3.4 - 2/3 to 8.2/3

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