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

Given: Present room temperature = 40°C
Decreasing the temperature every hour = 5°C
Room temperature after 10 hours = 40°C + 10 x (–5°C )
= 40°C – 50°C
= – 10°C
Thus, the room temperature after 10 hours is – 10°C after the process begins.

Class 7 Maths Exercise 1.3 Questions 6, 7, 8, 9

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