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STatiana [176]
3 years ago
9

Mr. Ellington has a total of 32 students in his class , The ratio of girls to boys is 3:5, how many girls are in Mr . Ellington'

s class ?
Mathematics
2 answers:
solmaris [256]3 years ago
7 0

Answer:

12

Step-by-step explanation:

If the ratio of girls to boys is 3:5, that means that for every 8 total students, 3 would be girls and 5 would be boys. Therefore 3/8 of the students are girls and 5/8 are boys. If 3/8 are girls, then:

\frac{3}{8} of 32

= \frac{3}{8} * 32

=\frac{3 * 32}{8} \\= \frac{96}{8} \\= 12

There are 12 girls.

Nadusha1986 [10]3 years ago
5 0

Add the ratio: 3 + 5 = 8

Divide total students by that:

32/8 = 4

The ratio for girls is 3, multiply the 4 by 3:

4 x 3 = 12

There are 12 girls

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Mario vende dos autos a 30 000 dólares cada uno. En la venta de uno ganó el 20% y en la
Mariana [72]

Answer:

Mario perdió dinero, perdió 2500 dólares

Step-by-step explanation:

En el primer caso, Mario está vendiendo su carro en 30 000 dólares. En otras palabras, el precio de venta es 30 000. Te dice que en el primer carro ganó 20%, o sea que su precio de venta es una incógnita que llamaremos x y gano 20% de x. Podemos expresarlo de esta manera

x = precio de compra carro 1

x + (20% de x) = 30 000

x = 100 % de x

(100% de x) + (20% de x) = 30 000

120% de x =30 000

120% = 1.2

1.2x = 30 000

x = 25 000

El segundo caso es bastante parecido. Te indica que el precio de venta sigue siendo el mismo, pero el precio de compra es diferente. El precio de venta sigue siendo 30 000, pero el precio de compra del segundo carro esta vez será "y". En este caso, pierde 20% del precio de compra, o osea, pierde 20% de y. Se puede expresar de la siguiente manera:

y = precio de compra carro 2

y - (20% de y) = 30 000

y = 100% de y

(100% de y) - (20% de y) = 30 000

80% de y = 30 000

80% = 0.8

0.8y = 30 000

y= 37 500

Entonces tenemos que el precio de compra del carro uno es 25 000 dólares y el precio de compra del carro dos es de 37 500. Si sumamos ambas cantidades, tenemos que ambos carros costaron 62 500 dólares. Como vendió esos dos autos a 30 000 dólares cada uno, recibió 60 000 dólares. El precio por el que vendió los autos (60 000) es menor al precio del que los compro (62 500), por lo que eso representa una perdida.

Para hallar la cantidad que ganó o perdió (en este caso perdió) debes restar el precio de venta menos el precio de compra.

60 000 - 62 500 = -2 500

Como es un número negativo, representa una perdida.

6 0
3 years ago
Solve for x. 12x+252=324
Murrr4er [49]

Answer:

x = 6

Step-by-step explanation:

12x+252=324

Subtract 252 from each side

12x+252-252=324-252

12x =72

Divide each side by 12

12x/12 = 72/12

x =6

5 0
4 years ago
Read 2 more answers
A dodgeball team at Lincoln Elementary School needs a team of 7 in order to compete against other schools. If there are 12 kids
horsena [70]

Using the combination formula, it is found that there are 792 ways to pick a team of 7.

The order in which the kids are chosen is not important, hence, the combination formula is used to solve this question.

<h3>Combination formula: </h3>

C_{n,x} is the number of different combinations of x objects from a set of n elements, given by:

C_{n,x} = \frac{n!}{x!(n-x)!}

In this problem, 7 kids are taken from a set of 12, hence:

C_{12,7} = \frac{12!}{7!5!} = 792

There are 792 ways to pick a team of 7.

To learn more about the combination formula, you can take a look at brainly.com/question/25821700

8 0
2 years ago
are there any points on the wheel that stay fixed or do not move when the wheel spins if so what are the points
aleksley [76]
There are no points on the wheel when i spins

6 0
3 years ago
Read 2 more answers
The perimeter of the square is 1 foot how many inches long is each sad
SpyIntel [72]
Im gonna asume you mean side, so 1 foot = 12 inches (: 
3 0
3 years ago
Read 2 more answers
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