Dmitri wants to cover the top and sides of the box shown with glass tiles that are 5mm square. How many tiles does he need? (The length is 15cm, the width is 20cm and the height is 9cm).

Question

Mathematics

Melany Simpson

4 February, 18:24

Dmitri wants to cover the top and sides of the box shown with glass tiles that are 5mm square. How many tiles does he need? (The length is 15cm, the width is 20cm and the height is 9cm).

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Answers (1)

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Derick Mendez · Answer 1

The Surface Area = lw + 2 lh + 2 wh;

The Surface Area = 15*20 + 2*15*9 + 2*20*9;

The Surface Area = 300 + 270 + 360;

The Surface Area = 570 + 360;

The Surface Area = 930cm^2;

The surface of glass tile is 5 * 5 = 25 cm^2;

Then, 930 : 25 = 37.2;

He need 38 tiles to cover the top and sides of the box shown.