A certain freezing process requires that room temperature be lowered from 50°C at the rate of 4°C every hour. What will be the room temperature 18 hours after the process begins ?

Options

A. `28^(@)` C
B. `-28^(@)` C
C. `22^(@)` C
D. `-22^(@)` C

Answer

D

Explanation

Since, the temperature decreasing at the rate of 4°C per hour . In 18 h temperature decreasing `18 xx 4^(@)` C I.e. 72°C. After 18 h the room temperature will `50^(@) - 72^(@) = -22^(@)`