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bekas [8.4K]
3 years ago
6

Anybody know what the answer is

Mathematics
1 answer:
koban [17]3 years ago
6 0
5. million 6. Ten thousand
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Mia and Holly can clean their room in 20 min, working together. Mia, working alone, can do the job in 30 min. How many minutes w
Sindrei [870]

Answer:

Option B. is correct

Step-by-step explanation:

Let x denotes time taken by Mia alone to clean the room and y denotes time taken by Holly alone to clean the room.

As Mia and Holly can clean their room in 20 min, working together,

\frac{1}{x}+\frac{1}{y} =\frac{1}{20}\,\,\,...(i)      

Also,

Mia, working alone, can do the job in 30 min.

So,

\frac{1}{x}=\frac{1}{30}\,\,\,\,\,...(ii)

Put (ii) in (i)

\frac{1}{30}+\frac{1}{y}=\frac{1}{20}\\\frac{1}{y}=\frac{1}{20}-\frac{1}{30}\\\frac{1}{y}=\frac{3-2}{60} \\\frac{1}{y}=\frac{1}{60}

Therefore,

Holly can clean the room alone in 60 minutes.

Option B. is correct

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Find an equation of the circle that has center , 1−1 and passes through , 32
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hello :<span>
<span>an equation of the circle Center at the A(a,b) and ridus : r is :
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in this exercice : a = 1  and b = -1 (Center at A (1 , -1) 
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Center at </span></span>A (1 , -1)  , passing through P(3, 2) is :  (x-1)² + (y+1)² = 13²

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2 Find the area of the
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