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Question
The length, breadth and height of a cuboid are in the ratio 7:6:5. If the surface area of the
cuboid is 1926 sq. cm. find the surface area of the cuboid.
cuboid is 1926 sq. cm. find the surface area of the cuboid.
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Solution
let l=7x b=6x h=5x
S.A. of cuboid=2[lb+bh+hl]
1926=2[7x × 6x + 6x × 5x + 5x × 7x]
1926=2[42x^2+30x^2+35x^2]
1926=2X107x^2
107x^2=1926/2=963
x^2=963/107=9
x=3
V=21X18X15=5670cm^3
S.A. of cuboid=2[lb+bh+hl]
1926=2[7x × 6x + 6x × 5x + 5x × 7x]
1926=2[42x^2+30x^2+35x^2]
1926=2X107x^2
107x^2=1926/2=963
x^2=963/107=9
x=3
V=21X18X15=5670cm^3
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