Question

the outer dimensions of a closed box are 42cm, 30cm and 20cm. the box is made of wood of thickness 1cm, determine the volume of wood used. ​

Answer 1

Answer:

5400cm³

Step-by-step explanation:

There are total 6 sides of 3 types

1) 42*30*1 = 1260 *2 for two sides = 2520

2) 42*20*1 = 840*2 for 2 sides = 1680

3) 30*20*1 = 600*2 for 2 sides = 1200

Total = 5400cm³

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Answer 2

Answer:

volume of wood used =  22591 cm³

Step-by-step explanation:

the outer dimensions of a closed box are 42cm, 30cm and 20cm. the box is made of wood of thickness 1cm,

so , the inner dimension of box  is ,

l ,42 - 1 = 41 cm

b , 30 - 1 = 29 cm

h , 20 - 1 = 19 cm

lbh  volume of wood used =

v = 41 × 29 × 19 = 22591 cm³