SSC CHSL 15 Nov 2015 Shift 2 Paper

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 = $\mathit{x}$ cm
Volume = $\left(\mathit{x}\times \mathit{x}\times 0.1\right)=\frac{{\mathit{x}}^2}{10}\mathit{c}{\mathit{m}}^3$
Given that 1 cu cm of brass has weight = 8.4 g
Thus, totalweight = $8.4\times \frac{{\mathit{x}}^2}{10}=0.84{\mathit{x}}^2$ gram
According to ques, ⇒ $0.84{\mathit{x}}^2=4725$
⇒ ${\mathit{x}}^2=\frac{4725}{0.84}=5625$
⇒ $\mathit{x}=\sqrt{5625}=75$ cm