Solve the following riddle:
I am a number,
Tell my identity!
Take me seven times over
And add a fifty!
To reach a triple century
You still need forty!

Solution:

We use the basic concepts of simple linear equations to solve the problem.

We will use the given information to make an equation with an unknown number as a variable.

Let's solve the equation to get the value of the number.

Let the number be x.

We know that 1 century = 100

Thus, triple century = 3 × 100 = 300

According to question,

7x + 50 + 40 = 300

7x = 300 − 90

7x = 210

x = 210/7

x = 30

Therefore, the number is 30.

☛ Check: Class 7 Maths NCERT Solutions Chapter 4

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Video Solution:

Solve the following riddle: I am a number, Tell my identity! Take me seven times over And add a fifty! To reach a triple century You still need forty!

NCERT Solutions for Class 7 Maths Chapter 4 Exercise 4.4 Question 4

Summary:

For the given riddle: I am a number, Tell my identity! Take me seven times over And add a fifty! To reach a triple century You still need forty! The unknown number is 30.

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