Question

a cubical block of metal measuring 45*30*0.5cm was melted and recast into cube of edge 5 cm. 1)find the number of cubes that can be made
2)find the cost of polishing at the rate of ₹1.25 per cm2

Answer
1)2500
2)168750
Show the working plz

Answer 1

I think your question need correction.

On taking measurement of cubical block as 45cm×30cm×0.5m and edge of cube as 3 cm I am getting following answers.

Answer:

1)2500 2)168750

Step-by-step explanation:

Given, Cubical block of measurement 45×30×50cm

Volume of cubical block= 45×30×50

= 67500 cubic cm

This cubical block is transformed into certain cubes of edge 5cm

Volume of 1 small cube = 3×3×3 = 27 cubic cm

Total surface area of small cube(A)

= 6×(Edge ×Edge)

= 6×3×3=54 sq cm

Rate of polishing(R) = ₹1.25 per sq cm

1) No. of cubes that can be formed

=Volume of cubical block/Volume of small cube

= 67500/27 = 2500

That means only 2500 such cubes can be formed from cubical block.

2) Total cost of polishing = Total no. of cubes×A×R

= 2500×54×1.25

= ₹168750

Hope you have understood. If yes then please-

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