Answer:
120 in^3
Step-by-step explanation:
to find volume, it's length times width times height. So 8*5*3, that equals 120
Set the 2 equations equal to each other since they both equal Y. then solve for X by moving all constants to one side and the X's to the other. you should get x=-3
To get the result we can use proportion
10% -----------80
100% ---------x
Crossmultiply now
10*x=100*80
10x=8000 /:10
x=800 - its the answer
33.333% -----------21
100% --------------x
crossmultiply
33.33x=21*100
33.33x=2100 /:33.33
x=63 - its the answeer