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Anna35 [415]
3 years ago
5

Dentro de cinco años mi abuelo tendrá el cuádruple de mi edad. Hace cinco años tenia siete veces mi edad¿que edad tenemos el y y

o?
Mathematics
1 answer:
Sergeeva-Olga [200]3 years ago
5 0

Answer:

La edad del abuelo es 75 años y la tuya es de 15 años.

 

Step-by-step explanation:

Si dentro de 5 años tu abuelo (A) tendrá el cuádruple de tu edad (E), tenemos:

A + 5 = 4(E + 5)  (1)

Ahora, si hace cinco años tenia siete veces tu edad:

A - 5 = 7(E - 5)    (2)

Multiplicando la ecuacion (1) por -1, tenemos:

-A - 5 = -4(E + 5)   (3)

Ahora sumando la ecuación (3) con (2):

-10 = 3E - 55

E = 15

Entonces, reemplazando el valor de E en la ecuación (1):

A + 5 = 4(15 + 5)

A = 75

Por lo tanto, la edad del abuelo es 75 años y la tuya es de 15 años.

Espero que te sea de utilidad!                                                          

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