OG详解-OG8 数学2 Q15

Choice D is correct. It’s given that the bowl starts with 20 ounces of water and has 9 ounces of water remaining after a period of time has passed. The amount of water the bowl has lost during the time period can be found by subtracting the remaining amount of water from the amount of water the bowl starts with, which yields 20-9 ounces, or 11 ounces. This means the bowl loses 11 ounces of water during that period of time. It’s given that the amount of water decreases by 1 ounce every 4 days. Letting t represent the number of days the bowl has been uncovered, it follows that 14​=11​t​. Multiplying both sides of this equation by 4t yields t = 44. Therefore, the bowl has been uncovered for 44 days.
Choice A is incorrect and may result from conceptual or calculation errors. Choice B is incorrect and may result from conceptual or calculation errors. Choice C is incorrect. This is the value of t for the equation 14​=9​t​  , not  =14​=11​t​.