OG详解-OG3 数学1 Q15

Choice D is correct. It’s given that the candle starts with 17 ounces of wax and has 6 ounces of wax remaining after a period of time has passed. The amount of wax the candle has lost during the time period can be found by subtracting the remaining amount of wax from the amount of wax the candle was made of, which yields 17-6 ounces, or 11 ounces. This means the candle loses 11 ounces of wax during that period of time. It’s given that the amount of wax decreases by 1 ounce every 4 hours. If h represents the number of hours the candle has been burning, it follows that1​4​=11h​. Multiplying both sides of this equation by 4h yields h = 44. Therefore, the candle has been burning for 44 hours.
Choice A is incorrect and may result from using the equation 1​4​=h11​ rather than 1​4​=11h​ to represent the situation, and then rounding to the nearest whole number. 
Choice B is incorrect. This is the amount of wax, in ounces, remaining in the candle, not the number of hours it has been burning. Choice C is incorrect and may result from using the equation 1​4​=6h​   .