Math
posted by Glen .
A donkey (D) and a mule (M) were carrying sacks of apples. The donkey groaned so the mule said to him, "Why are you complaining? If you gave me one sack, I would have twice as many as you; if I gave you one of my sacks, then we would have equal loads."
How many sacks was each carrying?

Start with the second
M1=D+1 or M=D+2
the first statement says:
(D1)2=M+1 Or M=2D3
so D+2=2D3
or D=5 and M=7 
Thank you!