We are given that Wednesday sales + Sunday sales = $5,040
Furthermore, Sunday's sales = Wednesday sales + $1,360
Let x = Wednesday sales; so, x + $1360 = Sunday sales
our equation becomes x + (x + $1360) = $5040, which becomes 2x + $1360 = $5040
combining terms, we get 2x = $3680, and x = $1840
So, Wednesday sales = $1840, and Sunday sales = $1840 + 1360 = $3200
We see that $1840 + $3200 = $5040