Answer:
Davide's age is 10.
L'età di Davide è 10.
Step-by-step explanation:
The average age of Aldo, Bruno, Carlo and Davide is 16 years.
I am going to say that:
x is Aldo's age.
y is Bruno's age.
z is Carlo's age.
w is Davide's age.
Average of the 4 is 16 years.
This means that:
[tex]16 = \frac{x + y + z + w}{4}[/tex]
[tex]x + y + z + w = 64[/tex]
If we do not consider Davide, the mean is 18. So
[tex]18 = \frac{x + y + z}{3}[/tex]
[tex]x + y + z = 54[/tex]
Replacing in the first equation:
[tex]x + y + z + w = 64[/tex]
[tex]54 + w = 64[/tex]
[tex]w = 10[/tex]
Davide's age is 10.
L'età di Davide è 10.