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

Question 6 Exercise 1.3

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?

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

Related Questions

In a class test containing 10 questions, 5 marks are awarded for every correct answer and (–2) marks...

Fill in the blank with an appropriate integer:**5 × __________ = –35**

Determine the integer which when multiplied with (–1) gives -37.

Determine the integer which when multiplied with (–1) gives -22.

Find the product using suitable properties: 8 × 53 × (–125) = ______________

State whether the following statement is TRUE or FALSE:

Exercises

Exercise 1.1

Exercise 1.2

Exercise 1.3

Exercise 1.4

Chapters

Integers

Fractions and Decimals

Data Handling

Simple Equations

Lines and Angles

The Triangle and its properties

Congruence of Triangles

Comparing Quantities

Rational Numbers

Practical Geometry

Perimeter and Area

Algebraic Expressions

Exponents and Powers

Symmetry

Visualising Solid Shapes