Two thermometers are calibrated,one in degrees Celsius and the other in degrees Fahrenheit.At what temperature is the reading on the thermometer calibrated in degrees Celsius five times the reading on the other thermometer?
A)-21.8 $\circ$ C
B)-20.0 $\circ$ C
C)-18.8 $\circ$ C
D)-4.00 $\circ$ C
E)-1.88 $\circ$ C

Question

Quizplus · Accepted Answer

To find the temperature where the Celsius reading is five times the Fahrenheit reading, use the formula $ C = \frac{5}{9}(F - 32) $. Set $ C = 5F $ and solve for $ F $, then find $ C $. The solution gives $ C = -20.0^\circ C $.

Two Thermometers Are Calibrated,one in Degrees Celsius and the Other ∘\circ∘

Two Thermometers Are Calibrated,one in Degrees Celsius and the Other $\circ$