1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Vladimir79 [104]
3 years ago
5

Today the ratio of Elinor's age to her mother's age is 3:8. After 15 years, the ratio will become 6:11. What is Elinor's age tod

ay?
Mathematics
1 answer:
amm18123 years ago
8 0
X=Elinor´s age today.
y=Mother´s age today.
(x+15)=Elinor´s age after 15 years.
(y+15)=Mohter´s age after 15 years.

We can suggest this systemen of equations:
x/y=3/8                                  ⇒x=3y/8
(x+15)/(y+15)=6/11              ⇒11(x+15)=6(y+15)

Finally, we´ll have the following system:
x=3y/8
11(x+15)=6(y+15)

We can solve this system of equations by substitution method:
11[(3y/8)+15)=6(y+15)
11[(3y+120)/8)=6y+90
33y+1320=8(6y+90)
33y+1320=48y+720
33y-48y=720-1320
-15y=-600
y=-600/-15
y=40

We find out the value of "x";
x=3y/8
x=3(40)/8
x=120/8
x=15

Answer: Elinor is 15 years old.
 
You might be interested in
If Adam and Eve were white then how are black people made, from brown cows? Not trying to be racist UwU
Free_Kalibri [48]

Answer:

If you want me to be honest with you, I will be. The reason black people got their skin color is really because someone was born with a lot of melanin, and what caused that was basically the region and climate the people are living in. People in Africa are most likely to be darker than those who live in Northern Europe.

Step-by-step explanation:

5 0
2 years ago
Using the foil method, multiply the terms of the binomials below. Show your work in the blanks provided. Then, add any like term
aalyn [17]

Answer:

5x^4+7x^3-6x^2

Step-by-step explanation:

(x^{2} +2x)(5x^{2} -3x)\\\= 5x^{4}-3x^{3} +10x^{3}  -6x^{2}\\= 5x^{4}+7x^{3} -6x^{2}

7 0
3 years ago
In a lab experiment, 50 bacteria are placed in a petri dish. The conditions are such that the number of bacteria is able to doub
timurjin [86]
Divide 50 and 20 and you get 2.5 then multiply that with 8 and you’ll get 20
THE ANSWER IS 20
8 0
3 years ago
Read 2 more answers
Cómo puedo hallar la longitud de un lado de un triángulo usando el teorema del ángulo de 30°
Elza [17]

En un triángulo rectángulo con ángulos de 30° -60° -90°, para encontrar la longitud de un lado, debes encontrar la longitud de la hipotenusa.

<h3 /><h3>¿Cómo encontrar la longitud de la hipotenusa?</h3>

Es necesario encontrar la longitud del cateto opuesto al ángulo de 30°, también conocido como cateto menor, y luego multiplicarlo por 2, descubriendo así el cateto de la hipotenusa, utilizando la fórmula del teorema de Pitágoras:

  • a²+b²=c²

Por lo tanto, puedes usar el teorema de Pitágoras para calcular la longitud del lado que falta en un triángulo rectángulo.

Encuentre más sobre el Teorema de Pitágoras aquí:

brainly.com/question/25839532

#SPJ1

5 0
1 year ago
Does 11/25 have a repeating decimal form
Lady bird [3.3K]
No


Hope that this helps you!
8 0
3 years ago
Other questions:
  • Help, I dont know how to solve for X​
    11·2 answers
  • 1. Tres iglesias se encuentran ubicadas en una ciudad, formando un triángulo rectángulo si la mayor distancia es igual a 338 met
    6·1 answer
  • What is the value of 4y+2y-8 if y=0.5
    9·1 answer
  • Grace folded clothes for 25mins then she worked on a puzzle for 45mins she started folding clothes at 8:20am what time did she f
    5·1 answer
  • WILL MARK BRAINLIST!!!!
    12·1 answer
  • El precio de un automovil $696.000 y se puede pagar de dos maneras distintas.
    13·1 answer
  • can we just all agree that teruhashi makes watching saiki worse like every time she comes up on my tv bragging how she’s the per
    15·1 answer
  • I really need helpppppp
    7·1 answer
  • 100.11256 round to the nearest 10th
    12·2 answers
  • Are the lines y=-5 and y=3 parallel
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!