The product of a number and 3 is added to 6 the result is 15 what is the number

The answer is 3.

Let the number is A

Then product of the number and 3 will be 3A

Now,  3A + 6  = 15 (given).  

Hence,  3A = 15 - 6  = 9

∴ 3A = 9    So, A = 9/3 = 3

Answer is 3

the answer would be the third option, "no, ariel should have added 9^2 and 12^2 and compared that to 15^2."

this is found through the pythagorean theorem, which is a^2 + b^2 = c^2.

this is the correct way of solving the problem:

9^2 + 12^2 = 15^2

81 + 144 = 225

225 = 225