Answer :
let X = Sean's height
Box = 4 feet tall
Box and Sean = 10 feet
10 = X+4
solve for X
10-4 = X
6 = X
so, Sean is 6 feet tall
Box = 4 feet tall
Box and Sean = 10 feet
10 = X+4
solve for X
10-4 = X
6 = X
so, Sean is 6 feet tall