There are 10 6-ounces of glasses that are only 4/5 full of water. How many ounces of water are needed to fill to the brim all those 10 glasses? Let's think first. Chain of thought:
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A glass is filled with 6 x 4 / 5 = 24 / 5 ounces of water. So, 10 6 - ounces of glasses contains a total of 24 / 5 x 10 = 48 ounces of water. To fill the 10 glasses to the brim, 10 x 6 = 60 ounces of water are needed. Hence, 60 - 48 = 12 ounces of water are still needed.
Therefore, the answer is 12.
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