Thickness of brass plate = 1 mm = 0.1 cm As the plate is in square shape, so the length and breath are same. ⇒ Length = Breadth = x cm Volume = (x×x×0.1)=
x2
10
cm3 Given that 1 cu cm of brass has weight = 8.4 g Thus, totalweight = 8.4×
x2
10
=0.84x2 gram According to ques, ⇒ 0.84x2=4725 ⇒ x2=