Adam buys a bigger turkey than he needs. the turkey he buys weighs 7 kg. he plans to carve the turkey at 17: 15.

But what is the query specifically?

Since the turkey wrighs 7kg and into 17:15?

Furthermore, rate is comparison between ratios.  While ratio is comparison between two or more numbers. Further, ratio on one hand, involves numbers either in amount, size, measurement, degrees, percentages or fractions with the absence of specific unit of measurement. On the contrary, rate is comparing quantities, amounts or unit of events happened expressed in a specific measurement or expressed under time. Take for instance, an example, Joe eats 2 while John eats 4 meals in a day. The ratio can be Joe: John, 2:4 meals. While the rate, is Joe eats 2 meals/day and John 4 meals/day.

50 % is the answer !