Si sumamos el cuadrado de un número más el cuadruple del siguiente resulta 225 ¿De que número se trata?

What does it say in english

Step-by-step explanation:

ill answer it in comments if you tell me what it says in english

10,000

Step-by-step explanation:

With a bike lock, you can usually use the same number more than one... you can have them the same (7777) if you want.

So, you have 10 possibilities for the first digit, 10 again for the second digit, 10 for the third digit... and also 10 for the last digit.  So...

10 * 10 * 10 * 10 = 10,000

These combinations range from 0000 to 9999