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erastovalidia [21]
2 years ago
7

Se requiere dos personas para construir una barda de 20 m de largo y 1.5 m de alto en dos días ¿cuántas personas se necesitan pa

ra construir otra barda igual en mediodía?
Mathematics
1 answer:
Wewaii [24]2 years ago
6 0

Answer:

Definamos R como la "velocidad" a la que una persona puede construir la barda dada.

Supongamos que la persona necesita un tiempo T para construir la barda, entonces tenemos la relación:

R*T = 1 barda.

Si dos personas trabajan juntas la velocidad de trabajo va a ser (R + R), y sabemos que ellos pueden completar el trabajo en 2 días, entonces:

(R + R)*2 días = 1 barda

(2*R)*2 días = 1 barda

(2*R) = (1/2) barda por día

R = (1/2)*(1/2) barda por día = (1/4) barda por día.

Esto significa que una persona puede completar un cuarto de la barda en un día de trabajo.

Ahora queremos saber cuantas personas se necesitan para construir una barda en solo medio día, entonces debemos resolver:

(N*R)*0.5 días = 1 barda

Donde N es el número de personas que queremos obtener.

(N* (1/4) barda por día)*0.5 días = 1 barda

N*(1/4) barda por día = (1/0.5) bardas por día = 2 bardas por día

N = 2/(1/4) = 2*4 = 8

N = 8

Se necesitan 8 personas para construir una barda en medio día.

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3 years ago
Mr. Hudson's bill when taking his family to a restaurant for dinner was $65. He used a discount card for 15% off and left a 20%
adell [148]

Answer:

Amount of bill after discount = $55.25

Amount of tip left = $13

Total money spent at the restaurant = $68.25

Step-by-step explanation:

Original bill amount of Mr. Hudson = $65

Discount card value = 15% of the bill

Tip offered = 20% of the original amount

To find:

Amount of bill after the discount of 15%.

Amount of tip left.

Total amount spent in the restaurant.

Solution:

Let us apply the percentage here to find the values of total discount, total tip offered.

Discount = 15% of $65

\Rightarrow \dfrac{15}{100} \times 65 = \$9.75

Amount of bill after discount = $65 - $9.75 = $55.25

Amount of tip left = 20% of $65

\Rightarrow \dfrac{20}{100} \times 65 = \$13

Total money spent at the restaurant = Amount of bill after discount + tip offered = $55.25 + $13 = <em>$68.25</em>

<em></em>

The answers are:

Amount of bill after discount = $55.25

Amount of tip left = $13

Total money spent at the restaurant = $68.25

4 0
3 years ago
Lisa's dog has 4 squeaky toys. Two thirds of the dog's toys are squeaky toys. How many dog toys does Lisa's have in all?
viva [34]
.  Lisa's dog has 4 squeaky toys   
.  the squeaky toys are 2/3 of all the dog's toys

.  let <em>x</em> be number of all dog toys

<em>make an equation</em>
(2/3)<em>x</em> = 4   <em>← solve</em>
x=6

<em>check</em>
2/3 × 6 = 4

<u>Lisa's Dog has 6 toys in all</u>



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3 years ago
7x-5y=-15 and -14x+7y=0 Solve by elimination
geniusboy [140]

Answer: (5,10)

Step-by-step explanation:

multiply first equation with 2 and add it to second to eliminate X

7x-5y=-15  //*2

14x-10y=-30

-14x+7y=0

----------------

-3y=-30

y=-30/-3

y=10

7x=50-15

7x=35

x=35/7

x=5

4 0
3 years ago
Please help me . What is x equal to?
777dan777 [17]

Answer:

1. x = 2

2. x = 6

3. x = 6

4. x = 1

Step-by-step explanation:  i think thats it

8 0
3 years ago
Read 2 more answers
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