Answer: 8
Step-by-step explanation:
P=5/6
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Answer: The only factor of 13 and 80 is 1.
Step-by-step explanation:
Factors of 13: 1, 13.
Factors of 80: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80.
The only factor they have the same is 1.
For this case we have that by definition, the volume of a rectangular prism is given by:

Where:
It is the area of the base
h: It is the height
So:

The volume of the prism is:

Now, the volume of the cubes is:

Thus, we divide and find the number of cubes to fill the prism:

ANswer:
n = 2.5
C=x+9, c+x=99, c=99-x
So we have two equations equal to c, c=x+9 and c=99-x, since c=c:
x+9=99-x
2x+9=99
2x=90
x=45, and since c=x+9, c=54
So Charlie weighs 54 kg and his brother weighs 45 kg.