A certain freezing process requires that room temperature be lowered from 40C at the rate of 5C ever...

Question

A certain freezing process requires that room temperature be lowered from 40C at the rate of 5C every hour What will be the room temperature 10 hours after the process begins

Accepted Answer

Let us take the lowered temperature as negative,

Initial temperature = 40^oC

Change in temperature per hour = -5^oC

Change in temperature after 10 hours = (-5) × 10 = -50^oC

∴The final room temperature after 10 hours of freezing process = 40^oC + (-50^oC)

= -10^oC

NCERT Solutions Class 7 Mathematics Solutions for Exercise 1.3 in Chapter 1 - Integers