Explanation:
60 cows
As, the number of cows that can graze the field in 12 days = 45
The number of cows that can graze the field in 1 days = 45 × 12 = 540
So, the number of cows that can graze the field in 9 days \(=\frac{540}{9}=60\text{ cows}\)
Hence, the correct alternative is option (a).
Note: This is a situation of inverse variation. More the number of cows, the faster will they graze the field.
The options given in the book are incorrect. The same has been corrected here.