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REY [17]
3 years ago
7

Beatriz tiene el triple de la edad de Rocio.

Mathematics
1 answer:
mina [271]3 years ago
4 0

Answer:

a) Beatriz: y = 3\cdot x, Jesús: z = 5\cdot x, b) y+z = 32, c) El símbolo (edad de Rocío) queda representado en el siguiente factor común: (3+5)\cdot x = 32, d) Rocío tiene 4 años de edad, Beatriz tiene 12 años de edad y Jesús tiene 20 años de edad.

Step-by-step explanation:

a) Sean x, y, z las edades de Rocío, Beatriz y Jesús. Después de una lectura cuidadosa al enunciado:

(i) <em>Beatriz tiene el triple de la edad de Rocío.</em>

y = 3\cdot x (Ec. 1)

(ii) <em>Jesús tiene cinco veces más años que Rocío.</em>

z = 5\cdot x (Ec. 2)

b) Seguimos la misma estrategia del punto a):

<em>Entre Beatriz y Jesús suman 32 años.</em>

y+z = 32 (Ec. 3)

c) Sustituimos y, z en (Ec. 3):

3\cdot x + 5\cdot x = 32

(3+5)\cdot x = 32

8\cdot x = 32

8\cdot x = 8\cdot 4

x = 4

El símbolo (edad de Rocío) queda representado en el siguiente factor común: (3+5)\cdot x = 32

d) Tal como desarrollamos en el punto c), Rocío tiene 4 años de edad.

Las edades de Beatriz y Jesús se obtiene por sustitución directa:

Beatriz

y = 3\cdot x

y = 3\cdot 4

y = 12

Beatriz tiene 12 años de edad.

Jesús

z = 5\cdot x

z = 5\cdot 4

z = 20

Jesús tiene 20 años de edad.

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