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wolverine [178]
3 years ago
13

Gabriela coleciona moedas e em sua coleção há 165 moedas de ouro,220 moedas de prata e 275 moedas de bronze. Ela deseja organiza

r essa coleção em caixas que tenham o mesmo número de moedas e de tal modo que cada caixa contenha o maior número possível de moedas de um só tipo.Nessas condições,quantas moedas Gabriela deve colocou-se em casa causa
Mathematics
1 answer:
kondor19780726 [428]3 years ago
7 0

Answer: 55 coins in each box (12 boxes in total)

Step-by-step explanation:

The question in english is as follows:

Gabriela collects coins and in her collection there are 165 gold coins, 220 silver coins and 275 bronze coins. She wants to organize this collection in boxes that have the same number of coins and in such a way that each box contains the largest possible number of coins of a single type.

Under these conditions, how many coins Gabriela should put in each box?

So, we have 165 gold coins, 220 silver coins and 275 bronze coins, which sum in total 660 coins.

If we want to organize these coins in boxes with the same number of coins, we have to calculate the greatest common divisor among these three numbers:

<u>Divisors for 165:</u> 33, 5, 1

<u>Divisors for 220:</u> 44, 5, 1

<u>Divisors for 275:</u> 55, 5, 1

As we can see, the greatest common divisor is 55, this means we have to put 55 coins of the same type in each box.

In addition, taking into account we have a total of 660 coins; if we divide this by 55 we have as a result 12 boxes.

Therefore, Gabriela has to put 55 coins of the same type in 12 boxes.

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The tree diagram is constructed and attached below in the image.

First we have to make a choice out of 3 subjects, so the probability of choosing art as the first subject is 1/3.

Once we have chosen art as the first subject, we have two choices. So the probability of choosing each option now is 1/2. Thus, the probability of choosing math, science is 1/2.

The probability of choosing the projects in order of art, math, science = 1/3 x 1/2 = 1/6

Therefore, the probability that the projects are in order of art, math, science is 1/6 (one over 6). So first option gives the correct answer.

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In a certain year, the price of gasoline rose by 20% during January, fell by 20% during February, rose by 25% in March, and fell
satela [25.4K]

Using decimal multipliers, it is found that the value of x is of 16.67.

<h3>What is a decimal multiplier?</h3>

Increases of a% or decreases of a% re represented by decimal values, as follows:

  • The equivalent multiplier for an increase of a% is given by: \frac{100 + a}{100}
  • The equivalent multiplier for an decrease of a% is given by: \frac{100 - a}{100}

In this problem:

  • The price at the beginning of January was of a.
  • Increase of 20% in January, hence 1.2a.
  • Decrease of 20% in February, hence 1.2(0.8)a.
  • Increase of 25% in March, hence 1.2(0.8)(1.25)a.
  • Decrease of x% in April, hence 1.2(0.8)(1.25)\left(\frac{100 - x}{100}\right)a

The price of gasoline at the end of April was the same as it had been at the beginning of January, hence:

a =1.2(0.8)(1.25)\left(\frac{100 - x}{100}\right)a

1.2\left(\frac{100 - x}{100}\right) = 1

\left(\frac{100 - x}{100}\right) = \frac{1}{1.2}

\frac{100 - x}{100} = 0.8333

100 - x = 83.33

x = 16.67

The value of x is of 16.67.

To learn more about decimal multipliers, you can take a look at brainly.com/question/24952336

6 0
2 years ago
Select the equivalent expression.
Free_Kalibri [48]

Answer:

\frac{7^{15}}{3^{30}}

Step-by-step explanation:

The given expression is:

(\frac{3^{-6}}{7^{-3}})^{5}

Moving the expression to the other side in the fraction changes its sign to opposite. A numerator with negative exponent, when written in denominator will have the positive exponent. Using this rule, we can write:

(\frac{3^{-6}}{7^{-3}})^{5}\\\\ = (\frac{7^{3}}{3^{6}} )^{5}

The exponent 5 can be distributed to both numerator and denominator as shown:

(\frac{7^{3}}{3^{6}} )^{5}\\\\ = \frac{(7^{3})^{5}}{(3^{6})^{5}}

The power of a power can be written as a product. i.e.

\frac{(7^{3})^{5}}{(3^{6})^{5}}\\\\ =\frac{7^{15}}{3^{30}}

So, the expression similar to the given expression and with positive exponents is: \frac{7^{15}}{3^{30}}

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Answer:

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Step-by-step explanation

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