Questions by vaibhav

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Many schools have a recommended students-teacher ratio as 35:1. Next year, school expects an increase in enrolment by 280 students. How many new teachers will they have to appoint to maintain the students-teacher

asked Jan 17, 2022 in 8th-maths

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If the area of a face of a cube is 10 `cm^2`, then the total surface area of the cube is

asked Jan 17, 2022 in 8th-maths

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160 `m^3` of water is to be used to irrigate a rectangular field whose area is 800 `m^2`. What will be the height of the water level in the

asked Jan 17, 2022 in 8th-maths

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If the radius of a cylinder is tripled but its curved surface area is unchanged, then its height will

asked Jan 17, 2022 in 8th-maths

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The volume of a cylinder becomes __________ the original volume if its radius becomes half of the original

asked Jan 17, 2022 in 8th-maths

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The curved surface area of a cylinder is reduced by ____________ per cent if the height is half of the original

asked Jan 17, 2022 in 8th-maths

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All six faces of a cuboid are __________ in shape and of ______

asked Jan 17, 2022 in 8th-maths

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Area of a rhombus = `1/2` product of

asked Jan 17, 2022 in 8th-maths

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Four horses are tethered with equal ropes at 4 corners of a square field of side 70 metres so that they just can reach one another. Find the area left ungrazed by the

asked Jan 17, 2022 in 8th-maths

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The area of a trapezium with equal non-parallel sides is 168 `m^2`. If the lengths of the parallel sides are 36 m and 20 m, find the length of the non-parallel

asked Jan 17, 2022 in 8th-maths

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A bicycle wheel makes 500 revolutions in moving 1 km. Find the diameter of the

asked Jan 17, 2022 in 8th-maths

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A carpenter makes a box which has a volume of 13,400 `cm^3`. The base has an area of 670 `cm^2`. What is the height of the

asked Jan 17, 2022 in 8th-maths

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A truck carrying 7.8 `m^3` concrete arrives at a job site. A platform of width 5 m and height 2 m is being contructed at the site. Find the length of the platform, constructed from the amount of concrete on the

asked Jan 17, 2022 in 8th-maths

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A hollow garden roller of 42 cm diameter and length 152 cm is made of cast iron 2 cm thick. Find the volume of iron used in the

asked Jan 17, 2022 in 8th-maths

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Three cubes each of side 10 cm are joined end to end. Find the surface area of the resultant

asked Jan 17, 2022 in 8th-maths

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Metallic discs of radius 0.75 cm and thickness 0.2 cm are melted to obtain 508.68 `cm^3` of metal. Find the number of discs melted (use π =

asked Jan 17, 2022 in 8th-maths

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A rectangular sheet of dimensions `25 cm xx 7 cm` is rotated about its longer side. Find the volume and the whole surface area of the solid thus

asked Jan 17, 2022 in 8th-maths

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Four times the area of the curved surface of a cylinder is equal to 6 times the sum of the areas of its bases. If its height is 12 cm, find its curved surface

asked Jan 17, 2022 in 8th-maths

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The length, breadth and height of a cuboidal reservoir is 7 m, 6 m and 15 m respectively. 8400 L of water is pumped out from the reservoir. Find the fall in the water level in the

asked Jan 17, 2022 in 8th-maths

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Plot the points (4, 4), (1, 3), (4, 2) and (7, 3) on a graph paper and connect them with line segments. Name the shape formed by these

asked Jan 17, 2022 in 8th-maths

Questions by vaibhav

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