Question

Solve the following riddle with explanation:
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!

Answer 1

Step-by-step explanation:

Let the number be n.

According to the question,

7n+50+40=300

⇒7n+90=300

⇒7n=300−90

⇒7n=210

⇒n= 210/7

⇒n=30

Thus, the required number is 30.