141.Three cubes each of volume 125 cm3 are joined end to end to form a cuboid. Find the total surface area of cuboid.
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142.A solid cube of side 16 cm is cut into eight cubes of equal volume. What will be the side of the new cube.
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143.To construct a wall 25 m long, 0.3 m thick and 6 m high, bricks of dimensions 50 cm x f5 cm x 10 cm, each are used. If the mortar occupies of the volume of the wall, find the number of bricks used.
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144.A village having a population of 2000, requires 150 litres of water per head per day. It has a tank measuring 20 m x 15 m x 6 m. Find how many days will the water of this tank last?
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145.A solid cuboid of dimensions 12 cm x 18 cm x 10 cm is cut into cubes of side 2 cm. How many such cubes can be cut from the cuboid? Compare the total surface area of the cube and cuboid.
146. The lateral surface area of a cube is 324 cm2. Find its volume and the total surface area.
Solution not provided.
Ans. 729 cm3, 486 cm2
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147.Find the volume, total surface area, lateral surface area and the length of diagonal of a cube, each of whose edges measures 20 cm.
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148.The height, breadth and length of a cuboidal box are in the ratio 1 : 2 : 3. Find the volume of the box if its surface area is 1078 dm2.
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149.The length of a room is double its breadth. Its height is 3 m. The area of the four walls excluding a door of dimensions 4 m x 2 m is 100 m2. Find its volume.
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150.A storage tank is in the form of a cube, when full has the volume of water as 15.625 m3. If the present depth of water is 1.3 m, find the volume of water already used from the tank.
Short Answer Type
of the volume of the wall, find the number of bricks used.
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