the word 'of'

was recalling my et(enviromental technology) lecturer's 'sermon'. he said tt printing 2 pieces of double sideded paper will 'salvage' 1/2 paper.(what he meant was originally 4 papers was actually needed then now used 2 instead thus saving 1/2 paper as in{ 1/2 X 4 =2})... was wondering this sentence.. used 2 pieces of paper double sided (we actually used 4 half paper).. then when use 4 pieces of paper single sided (isnt tt 4 half paper too?) ya? so wat e diff!

he should hav said printing 2 pieces of paper double sided can actually saved half of paper(e diff here is e word 'of').. half of paper is more appopriate... half of 4 gave us 2 .. thus is understandable ... 1/2 paper is not = 1/2 of paper..

catch ani balls??? guess nt ... @______@