Claudia has 122 ounces of water and is filling up cups. She has 8-ounce glasses, 5-ounce glasses, and 4-ounce glasses. If she fills six 5 ounce glasses and four 8 ounce glasses, how many 4 ounce glasses can she fill with the remaining water? Let's think first. Chain of thought:
She has used 32 ounces on 8 - ounce glasses because 4 x 8 = 32. She has used 30 ounces on the 5 - ounce glasses because 6 x 5 = 30. She has used 62 ounces in total because 32 + 30 = 62. She has 60 ounces left because 122 - 62 = 60. She can fill fifteen four - ounce glasses because 60 / 4 = 15.
Therefore, the answer is 15.