How much punch did Angela serve at a party?

Question

Angela mixes 6 7/8 pints of fruit juice and 4 1/4 pints of ginger ale to make punch for the party. She has 9 pints of punch left at the end of the party. How much punch did Angela serve at the party? Explain how you know your answer is reasonable. 

Answer 1

Assuming that only juice and ginger ale were used, the two mixed together would make 6 7/8 + 4 2/8 = 10 9/8 = 11 1/8 pints of punch. Since she had 9 pints left over, she served 11 1/8 - 9 = 2 1/8 pints