Answer:
At least 18 solid balls
Step-by-step explanation:
<h3>Volume of rectangular tank:</h3>

Volume of empty space = Volume of the full tank - Volume of the tank till the water.
= 20*10*13 - 20*10*11
= 2600 - 2200
= 400 cm³
Volume of 1 solid ball = 23 cm³
Number of solid ball to make the tank overflow = 400 ÷ 23
≈ 18 solid balls
Hey if you add each letter the possible outcome is 8
go down to (0, -9) on the graph, from there go up four and over one and plot the next point, up four over one again, and repeat