Respuesta :
Answer:
He is 3 years old.
Step-by-step explanation:
3 times 9 is 27. She is 9 times older than her 3 year old son.
Next year he will be 4 and she will be 28. 4 times 7 is 28. She will be 7 times older than her son.
Answer:
The son is 3 years now.
Step-by-step explanation:
Let x and y represent his age and his son's age respectively.
Given;
I am $9$ times as old as my son
9y = x ........1
Next year, I will be $7$ times as old as my son.
7(y+1) = x + 1 ....2
Substituting equation 1 to 2;
7(y+1) = 9y + 1
7y + 7 = 9y + 1
Collecting the like terms
9y - 7y = 7 -1
2y = 6
y = 6/2 = 3
Since x = 9y
x = 9(3)
x = 27
The son is 3 years and he is 27 years now.
