Answer:
16 Glasses
Explanation:
Since she has 4/5 cup of sugar and it requires 1/20 of a cup to make a single glass of lemonade, in order to get how many cups she can make we need to get the LCM (lowest common multiple) of both fractions (4/5 and 1/20). The LCM of 5 and 20 is 20. Now instead of 4/5 we have 16/20 and 1/20 remains the same. Since it takes 1/20 cup of sugar to make 1 glass of lemonade and Ashley has 16/20 cup of sugar, she can make 16 cups.