Question

at a cafetaria, two identical glasses of juice were poured at the same time and put on the counter waiting for customers to take them. their temperatures were 33F when they were poured and the cafetaria was a stable 72F. one glass was 36F when it was taken after 20 seconds. what was the temperature of the other when it was taken after 200 seconds?

Answer 1

20 seconds = 3F
so 200 seconds = 300F
isnt this just a ratio?

Answer 2

You could assume it's linear.

Your numbers are off though (in your second post). Check your orders of magnitude.