Mathematics

Oscar Montgomery

10 June, 10:10

Wallapak stores her malt beverages outside her house, on her back porch. On a very hot

day, she takes one such beverage and places it in her refrigerator, which is constantly kept at

4◦C. After 15 minutes, the beverage cooled down to 26◦C, and, after another 15 minutes, it

was at 15◦C. How hot was the beverage when it was placed in the refrigerator? Assume the

temperature of the beverage obeys Newton's Law of Cooling.