Pls help me pls pls please

[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
Weight of box :
weight if each ball :
Number of ping pong balls :
number of balls in box = 27