Click the "draw structure" button to activate the drawing utility. enter the structure corresponding to the iupac name. 4−ethyl−1,2−dimethylcyclohexane

Cyclohexane is represented as with an hexagonal shape.

1,2 dimethyl means that one CH3- group is attached to the carbon number one of the ring,  and other CH3CH2- group is attached to the carbon number two.

4-ethyl means that one CH3CH2- group is attached to the carbon number four of the ring.

So, following IUPAC nomeclature rules, your product should look like:

You can see this representation if the figure attached.

Adozen is 1221/12 = 1.751.75 x 12 = 21therefore, 1.75 is the answer.