First let's simplify our riddle and state it's important facts as bullet points.

* Two grips are in one glop.
* Six glops are in four grabs.

Now, using basic arithmetic : 

`2 Grips` `=` `1 Glop`  
 
 *and we know that :*  
 
 `6 Glops` `=` `4 Grabs`  
*also:*  
 `12 Grips` `=` `4 Grabs`     *[1 Glop = 2 Grips, 6 Glops &times; 2 = 12 Grips]*  
 
 *Now, how many grips in **&frac12;** grab :*  

 **3** &times; **&frac12;** = `3/2`

Thus, there are 3/2 or 1.5 Grips in **&frac12;** Grab.
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