Maths - Mensuration

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6. A solid cuboid is formed by mutual joining of 24 cubes of 1 cm side. If perimeter of the base of this cuboid is 12 cm, then height of cuboid will be

  • Option : C
  • Explanation : Volume of 24 cubes
    = 24 x 1 = 24 cm3 .
    Let the length, breadth and height of
    cuboid are, l, b and h.
    Ibh = 24 ... (i)
    According to the question,
    2(l+b)=12.
    1+ b=6.
    So, 1=4,b=2
    From (i), Ibh = 24
    h= 24/8 =3 cm
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7. The ratio of volumes of 2 cubes is 27 : 64. What will be the ratio of the areas of surfaces?

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