Respuesta :

Answer:

The given certain number is 17.

Step-by-step explanation:

Let the given certain number = k

So, according to the question,

2 + k = 2k - 15

or, 2 +  15  = 2k - k

or,  k = 17

hence the given certain number is 17.

CHECK:

2 more than 17 = 19, and

19 is 15 less than 2 times 17