A + B means, A is the father of B.

A – B means, A is the sister of B.

A × B means, A is the brother of B.

A ÷ B means, A is the mother of B.

If A + B × C – D ÷ E – F, then how is ‘C’ related to F ?

Mother’s sister

Explanation:

↑ or ↓ ⇒ Upward or downward line shown "generation gap" .

   =    ⇒ Double lines shown "relation b/w Husband & Wife"

   —   ⇒ single line shown "relation between them other than Husband & Wife".