# 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.

Use the given information to make an equation with an unknown number as a variable.

Solve the equation to get the value of the number.

Let the number be x.

According to question,

7x + 50 + 40 = 300

7x = 300 − 90

7x = 210

x = 210/7

Therefore, the number is 30.

**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

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!

The unknown number in the riddle is 30.