A community bakery used two automated ovens, Oven 1 and Oven 2, to bake identical dinner rolls for a fundraiser. The two ovens operated for the same number of hours, each at its own constant rate. During that time, Oven 1 baked exactly 192 rolls, and Oven 2 baked exactly 144 rolls. What was Oven 2’s production rate, in rolls per hour?We are told that the two ovens operated for the same number of hours and that Oven 1 baked exactly 192 rolls while Oven 2 baked exactly 144 rolls.
So, the ratio of their rates is 192/144 = 4/3.
(1) During the first 3 hours, Oven 1 baked 72 rolls.We can use this information to determine Oven 1's rate.
Also, using the information from the passage, we have determined the ratio of Oven 1's rate to Oven 2's rate.
So, we can use Oven 1's rate to determine Oven 2's rate.
Sufficient.
(2) Oven 2’s production rate was 6 rolls per hour less than Oven 1’s production rate.Using the information from the passage, we've determined that the ratio of Oven 1's rate to Oven 2's rate is 4/3 or 4x/3x.
Now, this statement provides the difference between their rates, which is 6 = x.
So, Oven 2's rate = 3x = 18.
Sufficient.
Correct answer: D