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!

Let the number be x.

(7x + 50) + 40 = 300

7x + 90 = 300

7x = 300 − 90 (Transposing 90 to R.H.S.)

7x = 210

Dividing both sides by 7,

x = 30

Therefore, the number is 30.

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