Question

The equivalent W/L of two MOS transistors with aspect ratio (W1/L) and (W2/L) respective connected in parallel is

Answer 1

It is significant to know that when the transistors are actually connected in the series, then their equivalent resistance value is added whereas your equivalent W/l ratio turns into 1/n times.

In this process, n can be considered as the number of connected transistors. The equivalent W/L of two MOS transistors with aspect ratio (W1/L) and (W2/L) respective connected in parallel is  successfully added to become (W1+W2)/l.