27x*6=6y+a 18x*9=6y+a
23x*9=9y+a
So 5x * 9 = 3y.
Therefore, y= 15x and a=72x.
Let's take days as the unit.
2 1Tx=Ty+a
T= 12
As mentioned above, grass can't be eaten, so a=0.
Imitate the above questions.
3.4.5 A type of topic, you can practice it.