## 111. Math Puzzle $8 / 74$

A horse and a donkey were walking side by side with a heavy load on their backs. The horse complained about its excessively heavy burden.

"Why are you complaining?", the donkey replied.

"If I take one sack from you, my load will be twice as heavy as yours. If you take one sack from my back, your load will be the same as mine."

How many sacks did the horse carry and how many did the donkey carry?
We receive a system of equations with two unknowns:

(I) $y+1=2(x-1)$ or $2 x-y=3$

(II) $y-1=x+1$ or $y-x=2$

The horse carried 5 sacks and the mule 7 sacks.