How many glucose molecules are needed to make 24 acetyls in pyruvate processing?

Glucose is converted into pyruvate in a process called Glycolysis which aim in production of energy for most of tissues inside our body... then pyruvate is converted into acetyl coA with the help of pyruvate dehydrogenase enzyme then this acetyl coA enters citric acid cycle for production of more energy 

One Acetyl molecule will be produced form one pyruvic acid. and two pyruvic acid molecule will be formed from one glucose molecule during glycolysis. so from

2 acetyl molecules → one glucose molecules.

For 24 acetyl molecules → ??

24*1/2 = 12.

The answer is 12 Glucose molecules.  

not clear