JIPMAT (LR) PYQs

If $+$ means $÷$, $÷$ means $-$, $-$ means $×$, and $×$ means $+$, then find the value of the following expression: $5 - (13 - 4 + 2 ÷ 6 × 15 ÷ 5)$

Find the number of triangles in the following figure :

In a family, each daughter has the same number of brothers as she has sisters and each son has twice as many sisters as he has brothers. How many sons are there in the family?