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Lyrx [107]
3 years ago
12

When building a house, the number of days required to build varies inversely with with the number of workers. One house was buil

t in 55 days by 8 workers. How many days would it take to build a similar house with 40 workers?
Mathematics
1 answer:
masha68 [24]3 years ago
8 0

Answer:

See below

Step-by-step explanation:

We can make a the number of days and y the number of workers

Since we were told there is an inverse relationship between the days required to build the house and the number of workers required, then,

The equation would be

y = k/x

Here, y is inversely proportional to x and k is the constant proportionality

So, out required equation would be

a = k/n

Fixing the values, we'll have

55 = k/8

k = 55 × 8

k = 440

The number of days required to build a similar house with 5 workers will now be

= 440/5

= 88 days

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Suppose that several insurance companies conduct a survey. They randomly surveyed 350 drivers and found that 280 claimed to alwa
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Answer:

Lower limit = 0.76

Upper limit = 0.84

Step-by-step explanation:

We are given the following in the question:

Sample size, n = 350

Number of drivers that buckle = 280

Formula:

p' = \dfrac{x}{n} = \dfrac{280}{350} = 0.8

q' = 1-p' = 1 - 0.8 = 0.2

The standard deviation for sp =

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95% Confidence Interval:

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Putting the values, we get,

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Answer:

Noor's age is 12 & Salma's age is 18

Step-by-step explanation:

Noor's age: N

Salma's age: S

N+S=30             : given

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3S = 54  : add like values

\frac{3S}{3} = \frac{54}{3}   : divide both sides by 3

S = 18

now insert that value into the initial equation:

N + 18 = 30

N = 12  : subtract 18 from both sides

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