In a company 3/5 of people know shorthand 1/4th know typing
and 1/5 know both. What fraction of people do not know both?

Answer Posted / mukul

number of people who only know shorthand =3/5-1/5=2/5
number of people who only know typing =1/4-1/5=1/20
total no of people who kow one one or other or both =2/5+1/20+1/5=13/20
people who do not know both= 20/20-13/20=7/20
=7/20*100
=35%

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