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1. A plate on square base made of brass is of length x cm and width 1 mm. The plate weights 4725 gm. If 1 cubic cm cm of brass weight 8.4 grams, then the value of x is :

Solution:
Given length and width of a square base plate of brass is x cm and 1 mm
Volume of the plate of square base = Area of base × height
=x2×110=x210cu.cm.
According to the question,
x210×8.4=4725x2=4725×108.4x2=5625x=5625=75cm

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