A + B means A is sister of B.

A – B means A is son B.

A × B means A is father of B.

A ÷ B means A is brother of B.

If S × M ÷ P + Q × R – C, then how Q related to C?

Husband

↑ 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".

Husband is correct. Because R is son of C and Q both, but Q is already male. So, C must be his wife.