Answers

2015-09-06T13:57:53+08:00
The thing here is:
9 x __ = 90

Now let's configure what is missing. Yeah. I know it's ten. 

9 x 10 = 90

So... 9 is after ten...

Next... 8 x __ = 72

Now let's configure what is missing. It is 9

8 x 9 = 72

And 9 is after 8...

So in 3 x __ = __

What is the next number to three? 4
4 x 3? = 12

The answer is
3 = 12
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2015-09-06T19:56:02+08:00