In a class, (1/10)th of the kids have pens and (4/5)th have pencils and no one has both. What fraction of kids have neither?
Fraction of children with pens = 110
Fraction of children with pencils = 45
Fraction of children having either a pen or a pencil = 110+4×25×2
=1+810=910
∴ Fraction of children who neither have a pen nor a pencil
=1−910
=110