Ronnie is thinking of a number. He says that he gets the same result when he multiplies his number by 2 as when he adds 5 to his number. What is the number?

Answer 1

2 n = n + 5 ?

n = 5

Answer 2

of course now that you mention it, adding a number to itself is kind of like multiplying it by two
if it were six instead of five
6+6 = 12
2*6 = 12