Solve this 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 riddle is a mathematical problem. Here's how to solve it:

1. Let's denote the unknown number as x.

2. According to the riddle, "Take me seven times over, And add a fifty!" This can be written as: 7x + 50.

3. The riddle then says, "To reach a triple century, you still need forty." A triple century is 300 (as a century is 100), and you still need 40 to reach it. This means that 7x + 50 = 300 - 40.

4. Simplifying the equation gives: 7x + 50 = 260.

5. To solve for x, subtract 50 from both sides of the equation: 7x = 260 - 50, which simplifies to 7x = 210.

6. Finally, divide both sides of the equation by 7 to solve for x: x = 210 / 7, which simplifies to x = 30.

So, the number in the riddle is 30.