Jovani bought 4 fottballs this was 40% of what they had available on that day how many footballs were available that day answer this.

Let's divide the percentage by the number of footballs.
40÷4
10
So every ball is 10 percent of all the balls. 
100÷10
10
So there were 10 footballs available.

If you make you answer for clear i can answer it : )