It is a very simple question. Clearly "1/2" means half. The input is 0010101110 whose decimal equivalent is 174. After passing the input through the so called "1/2" the output is 87 whose equivalent in binary system is 0001010111.
Also very peculiar thing to be noted is that output is right shifted by one place. This menas whenever you see "1/2" shift the binary input by 1 place.