How many 25ml do you need to make 160ml?

To determine how many 25ml portions are needed to make 160ml, you divide 160ml by 25ml. This calculation gives you 6.4. Since you can't have a fraction of a portion, you would need 6 full 25ml portions for a total of 150ml, and then an additional 10ml to reach 160ml. Thus, you would need 6 portions of 25ml and an additional 10ml.