Question

If $18$ cows can graze field in $20$ days, how many cows can graze the same filed in $15$ days?

Answer 1

No. of cows grazed the field in $20$ days $=18$

No. of cows required to graze the field in $1$ day $=18\times 20$

No. of cows required to graze the field in $15$ day $=\frac{18\times 20}{15}=24\text{cows}$