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katovenus [111]
3 years ago
10

12 obreros se demoran 3 días para realizar un trabajo, cuántos días se demorarán si se tienen la mitad de 8 obreros

Mathematics
1 answer:
valentinak56 [21]3 years ago
5 0

Answer: X=9 Dias

Se demoran 9 dias

Step-by-step explanation:

Regla De Tres

Quien   Tiempo  Obra

12               3            1          x= 12*3/4

4                 x             1         x= 36/4

                                             x=9

otra forma

Paso uno   x = 12*3*1 =  x= 36

                          4x    =    x= 4

Paso dos   x= 36/4 =   x= 9 dias

dividir.

Espero que les ayude

     

   

         

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Using linear combination method to solve the system of equations 3x - 8y = 7  and x + 2y = -7 is (x, y) = (-3, -2)

<h3><u>Solution:</u></h3>

Given that, a system of equations are:

3x – 8y = 7 ⇒ (1) and x + 2y = - 7 ⇒ (2)

We have to solve the system of equations using linear combination method and find their solution.

Linear combination is the process of adding two algebraic equations so that one of the variables is eliminated. Addition or subtraction can be used to perform a linear combination.

Now, let us multiply equation (2) with 4 so that y coefficients will be equal numerically.

4x + 8y = -28 ⇒ (3)

Now, add (1) and (3)  

3x – 8y = 7  

4x + 8y = - 28  

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7x + 0 = - 21  

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Now, substitute "x" value in (2)

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3 0
3 years ago
A pump fills 25 of a tank in 23 hour. At this rate, how much of the tank will the pump fill in an hour?
Sophie [7]

60% or 3/5 of the tank will be filled in an hour.

The pump will fill 2/5 of the tank in 2/3 hours.

In order to find out how much of the tank will be filled in an hour, use direct proportion and assume portion of the tank that will be filled up in an hour is x.

<em>2/5 of tank        :            2/3 hours </em>

<em>x of tank            :             1 hour </em>

Cross multiply to get:

2/3x = 2/5

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x = 2/5 x 3/2

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In conclusion, 60% of the tank will be filled in an hour.

<em>Find out more at brainly.com/question/14336804.</em>

6 0
2 years ago
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Fittoniya [83]

Answer:

y≤5

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y ≤ 5

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7 0
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