Answer:
Emma would need 7/8 gallons of Ginger Ale to make the total of 4 gallons of punch.
Step-by-step explanation:
In the question, Emma used different quantities of juice to make a punch. To find the remainder, needed to make 4 gallons, we sum up the given quantities, and subtract it from the expected amount.
The summation of the given quantities of juice is as follows;
3/4 + 1 1/2 +7/8 = 25/8
We no subtract the quantity we already have from the expected amount, which is 4 gallons, thus;
4 - 25/8 = 7/8 gallons of Ginger Ale.
To confirm the answer, we sum up all the given quantities. Therefore;
3/4 + 1 1/2 + 7/8 + 7/8 = 4 gallons of punch.