greetings there are 2 Math word problem questions

Question

.Andrei wants to fill a glass tank with marbles, and then fill the remaining space with water.W(n) models
the amount of water Andrei uses (in litres) if he uses n marbles:W(n)=32-0.05n
1.What is the glass tank's volume?
2.What is the amount of water Andrei will use if he uses 150 marbles?

Answer 1

1.What is the glass tank's volume?

 

   Well, how much water (W) is used when there are no (n) marbles in the tank?

       W(0)=32-0.05*(0)

       W(0) = 32 liters

 

2.What is the amount of water Andrei will use if he uses 150 marbles?

       W(150)=32-0.05*(150)

       W(150 = 24.5 liters