${(1.6)^2} div {(0.8)^2} - [{(2.4)^2} div left( {0.4{)^2}} ight];?$

${(1.6)^2} div {(0.8)^2}$ $= [{(2.4)^2} div left( {0.4{)^2}} ight] - ?$

$⇒frac{{1.6 ×1.6}}{{0.8 ×0.8}} = frac{{2.4 ×2.4}}{{0.4 ×0.4}} − ?$

$Rightarrow 4 = 36 − ?$⇒?=36−4=32