On the alien world of sur'kesh, the standard unit of length is the plok, which is equivalent to 2.6 feet. in addition, there are 6 pleeka in every plok (much like there are 12 inches in a foot). if you are told the average height of a sur'kesh alien is 18 pleeka, how many inches tall would they be?

So they are 93.6 inches tall

Explanation:

We have given that 1 plok is equivalent to 2.6 feet '

So 1 plok = 2.6 feet

It is given that 1 plok = 6 pleeka

And height of Sur'Kesh is 18 pleeka

As we know that 1 plok = 6 pleeka

So 18 pleeka

As 1 plok = 2.6 feet

So 3 plok = 3×2.6 = 7.8 feet

And it is given that 1 foot = 12 inches

So 7.8 feet = 7.8×12 = 93.6 inches