Let the efficiency of each man be '2x' units/day
So, total work = 2x X 12 X 15 = '360x' units
And efficiency of a child = 2x ÷ 2 = 'x' units/day
So, required time = (360x X 0.6) ÷ (8 X x) = 27 days
A hollow cylinder is made up of steel. the difference in its outer and inner curved surface area is 132cm2.Height of cylinder is 21 cm and su...
A giant circular wheel has a diameter of 28 metres. In how many revolutions will the wheel cover a total of 11 km?
Perimeter of a square field is 120 meters and the area of a rectangular field is 65% more than that of the square field. Find the area (in m2...
What will be the total surface area of a triangular pyramid whose sides are all 1 cm long?
The capacity of a cylindrical tank is 2376 m³. If the radius of the tank is 21 m, then the depth of the tank is:
The perimeter of a rectangular field is 480 meters and the ratio between the length and breadth is 5:3. The area of the field is:
B is 25 percent more than C and C is 73 percent less than D. If B is 729, then what is the value of D?
The sum of the radius and height of a cylinder is 42m. The total surface area of the cylinder is 5544 m². What is the volume of the cylinder?
The area of the floor of a cubical room is 49m². The length of the longest rod that can be kept in the room is
The area of a regular hexagon with side as 6 cm is
