# 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?

**Solution:**

The present temperature of room = 40°C

Decrease in temperature after every hour = 5°C

Temperature of room after 10 hours

Decrease in temperature can be exressed as - 5°C

= 40°C + 10 × (-5°C)

= 40°C + - 50°C

= -10°C

Thus, the room temperature after 10 hours is -10°C, after the process begins.

**☛ Check: **NCERT Solutions for Class 7 Maths Chapter 1

**Video Solution:**

## 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?

NCERT Solutions Class 7 Maths Chapter 1 Exercise 1.3 Question 6

**Summary:**

If a certain freezing process requires that room temperature be lowered from 40°C at the rate of 5°C every hour, the room temperature 10 hours after the process begins will be -10°C.

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