A math problem, I bought 100 rabbits with 100 yuan, including male rabbits 1 7 yuan, female rabbits 1 5 yuan and 7 rabbits 1 yuan. I asked some male rabbits. ...
Solution: Set X male rabbits, Y female rabbits and Z small rabbits.
7x+5y+ 1/7z= 100
X, y are integers, and z is divisible by 7.
So x=4, y= 12 and z=84.
Answer: There are 4 male rabbits, 0/2 female rabbits and 84 small rabbits.
You can check:
4×7+ 12×5+ 1/7×84
=28+60+ 12
= 100 (yuan)