In the circuit $(\frac{W}{L})=(\frac{2}{3})$ for $Q_{\text{R}\text{E}\text{F}}$ and $(\frac{W}{L})=(\frac{4}{5})$ for the other MOSFETs. The MOSFETs are identical in all other respects. If $I_{\text{R}\text{E}\text{F}}=30A,$ what is $I_A?$

$I_A=3**\frac{4}{5}**\frac{I_{\text{R}\text{E}\text{F}}}{\frac{2}{3}}$

$=108mA$

This is the right answer but can you explain it more in detail