First of all, you need to compare the two statements. That will be; 1/4= 1 batch 3=Y Y is the unknown number of batches. So we need to find Y. Next, cross and multiply. 3 will multiply 1 to give 3 and Y will multiply 1/4 to give 1/4Y. That will be; 1/4Y=3 1/4 Y is the same as Y/4. So you have; Y/4=3 3 is the same as 3/1 Y/4=3/1 Cross and multiply. Y will multiply 1 to give Y and 3 will multiply 4 to give 12. That will be; Y=12 3 bags will make 12 batches of cookies. Hope that helped. Have a nice day