Rachel drinks 2 glasses of water on Sunday and 4 glasses of water on Monday. Then she drinks 3 glasses of water every day for the next 4 days. One glass of water is 10 ounces of water. If Rachel wants to drink a total of 220 ounces of water in the week (Sunday to Saturday), how many glasses of water should she drink on Saturday? Let's be accurate as possible.
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From Sunday and Monday, Rachel drinks 2 + 4 = 6 glasses of water. From Tuesday to Friday, Rachel drinks 3 * 4 = 12 glasses of water. The total glasses of water she drinks from Sunday to Friday is 6 + 12 = 18 glasses of water. The total ounces of water she drinks from Sunday to Friday is 18 * 10 = 180 ounces. The ounces of water she should drink on Saturday is 220 - 180 = 40 ounces. The glasses of water she should drink on Saturday is 40 / 10 = 4 glasses of water.
The answer: 4.
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