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Dmitriy789 [7]
3 years ago
8

In the soccer games so far this season, Letty has had 15 goals in 20 attempts at a goal. What is the probability, expressed as a

percent, that she will get a goal the next time she tries for one?
A) 15%
B) 20%
C) 60%
D) 75%
Mathematics
2 answers:
Inga [223]3 years ago
6 0
20 is 1/5 of 100 so do 20x5=100 and 15x5=75


So there is a 75% chance she will make the goal
pychu [463]3 years ago
5 0
The answer would be D because 20 divided by 4 is 5 and 5 times 3 is 15 so 100 divided by 4 would be 25 and then that times 3 equals 75.
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5 0
3 years ago
Read 2 more answers
When two computers are working together, they can finish updating software in 9 minutes. How long would they take individually t
tensa zangetsu [6.8K]
First computer takes x min. For 1 min it does 1/x part of work.

Second computer takes (x+24) min. For one min it does 1/(x+24) part of work.

Both computers for one min do   (1/x+1/(x+24)) part of work.

At the same time, both computers for one min do 1/9 part of work.

\frac{1}{x} + \frac{1}{x+24} = \frac{1}{9} 
\\ \\  \frac{x+24+x}{x(x+24)} =  \frac{1}{9} 
\\ \\9(2x+24)=x^{2} +24x
\\ \\ 18x+216=x^{2} +24x
\\ \\ x^{2}+6x-216=0
\\ \\ D=b^{2}-4ac=36+4*216 = 900
\\ \\ x= \frac{-b+/- \sqrt{D} }{2a}  =  \frac{-6+/-30}{2} 
\\ \\ x_{1}=-18, x_{2}=12

We can use only positive number here. So, 

for the first computer x=12 min,

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Answer 12 min and 36 min.


7 0
4 years ago
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