Question

5/6 of 18 pencils what is it

Answer 1

We have a proportion: ?/18= 5/6

Cross multiply:
6*?= 5*18
⇒ ?= 5*18/6= 15

5/6 of 18 pencils is 15 pencils~

Answer 2

18/6=3*5=15. Your answer is 15. :)