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:


If we do not consider Davide, the mean is 18. So


Replacing in the first equation:



Davide's age is 10.
L'età di Davide è 10.
Answer:
10
Step-by-step explanation:
This is a combinations problem, involving factorials.
5!/3!*2!=5*4/2=20/2=10
3x + 4y = 32....multiply by 5
5x + 5y = 50...multiply by -3
---------------
15x + 20y = 160 (result of multiplying by 5)
-15x - 15y = -150 (result of multiplying by -3)
--------------add
5y = 10
y = 10/5
y = 2
3x + 4y = 32
3x + 4(2) = 32
3x + 8 = 32
3x = 32 - 8
3x = 24
x = 24/3
x = 8
solution (8,2)
The students conclusion is incorrect......it is answer choice 1
So, out of 60 balls, 48 passes and 12 did not that gives us a failure rate of 20%
20% of 2500 = 2000 hence 500 balls would not pass inspection,
Answer and explanation:
Find answer and explanation attached