sean sold 4 more boxes of candy for the school fundraiser than Chris. The sum of the boxes that they sold was 22

c = boxes of candy chris sold

s = boxes of candy sean sold

s = chris + 4

s = c+4

chris boxes + sean boxes = 22

c+s = 22

substitute s = c+4 into the above equation

c + (c+4) = 22

combine like terms

2c+4 = 22

subtract 4 from each side

2c+4-4 = 22-4

2c = 18

divide each side by 2

2c/2 = 18/2

c = 9

s = c+4

substitute c=9 into s=c+4

s = 9+4

s=13

Answer:Chris sold 9 and Sean sold 13