the cost of painting 35 identical wooden cubical boxes at the rate of rs 20 per centimetre square is rs 1,51,200 . find the edge of each cubical box .
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cost of painting 1 cube = 151200/35
= 4320
Surface area of 1 cube = 4320/20 = 216
Surface area of cube = 216 cm sq. = 6a^2
= 216/6 = a^2
36 = a^2
√36 = √a^2
a = 6 or -6
Length can't be negative
So a = 6
Side of cubical box = 6cm
= 4320
Surface area of 1 cube = 4320/20 = 216
Surface area of cube = 216 cm sq. = 6a^2
= 216/6 = a^2
36 = a^2
√36 = √a^2
a = 6 or -6
Length can't be negative
So a = 6
Side of cubical box = 6cm
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