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Kaden had 20 more stamps than Susan. Susan gave Kaden 1 stamp . How many more stamps did Kaden have than Susan in the end.
Let Susan have x stamps
She gave Kaden 1 stamp
So she had x-1 stamps
Kaden had 20 more stamps than Susan
So Kaden had x+20 stamps
After he got 1 stamp from Susan he had x+21 stamps
Difference between the number of stamps they had
(x+21)-(x-1)
= 22 stamos
Kaden has 22 more stamps than Susan in the end