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A wood of block measuring 5 in. by 6 in. by 7 in. is painted blue. It is then completely cut to cubes which measure 1 in. on an edge. How many cubes have 1 blue face?

 

 Jan 31, 2021
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On the top  we  have   (6 - 2) (7 -2)  =   4 * 5  = 20

 

On one side we have  (5 - 2) (7 - 2)  =  3 * 5  =  15

 

On the front   we have (5 - 2) ( 6 - 2)  = 3 * 4    = 12

 

So  doubling each of these we  have

 

2 ( 20 + 15 + 12)   =

 

2 ( 47)  =

 

94

 

cool cool cool

 Jan 31, 2021
edited by CPhill  Jan 31, 2021

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