MathDB
Converting Temperatures

Source: AIME I 2007 #5

March 15, 2007
AMCAIMEnumber theory

Problem Statement

The formula for converting a Fahrenheit temperature FF to the corresponding Celsius temperature CC is C=59(F32)C=\frac{5}{9}(F-32). An integer Fahrenheit temperature is converted to Celsius and rounded to the nearest integer; the resulting integer Celsius temperature is converted back to Fahrenheit and rounded to the nearest integer. For how many integer Fahrenheit temperatures TT with 32T100032 \leq T \leq 1000 does the original temperature equal the final temperature?