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3 years ago

It’s takes 53 minutes for 6 people to paint 6 walls. How many minutes does it take 20 people to paint 20 walls ?

Mathematics

2 answers:

kramer3 years ago

7 0

Answer:

Step-by-step explanation:

It is a trick question. 6 people to paint 6 walls will take 53. 20 people to paint 20 walls will take 53 minutes.

Sholpan [36]3 years ago

7 0

Answer:

Time taken for 20 peoples to paint 20 walls = 53 minutes

Step-by-step explanation:

It’s takes 53 minutes for 6 people to paint 6 walls.

$\texttt{Time taken for a guy to paint 6 walls =}53\times 6=318minutes\\\\\texttt{Time taken for a guy to paint 1 wall =}\frac{318}{6}=53minutes$

Now we need to find how many minutes does it take 20 people to paint 20 walls.

$\texttt{Time taken for a guy to paint 20 walls =}53\times 20=1060minutes\\\\\texttt{Time taken for 20 peoples to paint 20 walls =}\frac{1060}{20}=53minutes$

Time taken for 20 peoples to paint 20 walls = 53 minutes

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In a class of 25 students, 15 of them have a cat, 16 of them have a dog and 3 of them have neither

Sphinxa [80]

Answer:

9/25

Step-by-step explanation:

Our denominator is the total amount in class. x/25

Our numerator is the total of people are "the probability that a student chosen at random has a cat and a dog" Which is -9.

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3 years ago

The lengths of the sides of a square are 5 cm. find the length of the diagonal

jenyasd209 [6]

Answer:

square root (50) = 7.071

Step-by-step explanation:

Using Pthagoras' theorem, the diagonal length is $\sqrt{x} ax^{2} +bx^{2}$ .

Therefore, the diagonal length is the square root of 5^2+5^2,

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3 years ago

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NikAS [45]

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Step-by-step explanation:

5 x 3.14(pi) = 15.7

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3 years ago

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Nataliya [291]

Answer:

(x^2 + x -1) x (x^2+3x-3)

Step-by-step explanation:

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3 years ago

Approximately 14 percent of the population of Arizona is 65 years or older. A random sample of five persons from this population

Andreas93 [3]

Answer:

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Step-by-step explanation:

For each person, there are only two possible outcomes. Either they are 65 or older, or they are not. The probability of a person being 65 or older is independent of any other person. So we use the binomial probability distribution to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$