Answer :
Marta is represented by x,
Sean is represented by x+4,
x+x+4=22
2x+4=22
2x=18
x=9
So Marta sold 9 boxes and Sean sold 13.
Sean is represented by x+4,
x+x+4=22
2x+4=22
2x=18
x=9
So Marta sold 9 boxes and Sean sold 13.