I worded the question as: "What's the temperature difference between 43°C and 23°C in Fahrenheit?" and GPT3.5 answered correctly.
If I say "recalculate the celcius to farenheit rewriting as little as possible in this sentence: Malawi swelters in record heat with temperatures nearly 20C above average"
Attempt 1. Malawi swelters in record heat with temperatures nearly 36°F above average.
Attempt 2. Malawi swelters in record heat with temperatures nearly 68°F above average.