A donkey is carrying a load on its back.
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The mule was carrying 5 sacks and the donkey was carrying 7
sacks.
Let's assume that the mule was carrying M sacks and the
the donkey was carrying D sacks.
As the donkey told the mule, "If you gave me one of your
sacks I'd have double what you have."
D + 1 = 2 * (M-1)
D + 1 = 2M - 2
D = 2M - 3
The donkey also said, "If I give you one of my sacks we'd
have an even amount."
D - 1 = M + 1
D = M + 2
Comparing both the equations,
2M - 3 = M + 2
M = 5
Substituting M=5 in any of the above equation, we get D=7
VERIFICATION-
5 - 1 = 7 + 1/2
4 = 4
5 + 1 = 7 - 1
6 = 6
VERIFIED
Hence, the mule was carrying 5 sacks and the donkey was
carrying 7 sacks.
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