x+ 1/5x= 18
x= 15
1/5x=3
A: White rabbits 15, 3 black rabbits.
2. Solution: If Company B has X production machine tools, then Company A has (x-8) production machine tools.
12/ 13x=x-8
x= 104
x-8=96
Answer: Company B produces 104 machine tools, and Company A produces 96 machine tools.
In fact, these two questions are aimed at making the unit clear, or you can make the unit directly without equations. It will be easier to use equations. When A is the score of B, the best way is to set B as X, which is easier to understand.