Question
50 children can decorate a hall in 25 days. If 25
children began decorating and after 10 days βzβ additional children joined, completing the decoration in 20 more days, find βzβ.Solution
Total work = 50 Γ 25 = 1250 units Work completed by 25 children in 10 days = 25 Γ 10 = 250 units Remaining work to be completed by (25 + z) children = 1250 β 250 = 1000 units Therefore, (25 + z) Γ 20 = 1000 Or, 25 + z = 1000 / 20 Or, 25 + z = 50 Or, z = 50 β 25 = 25 Number of children added = 25
The side of a square is equal to the perimeter of an equilateral triangle of area 36√3 cm2 . Find the area of the square?
In AABC, P is a point on AB such that PB: AP = 3: 4 and PQ is parallel to AC. If AR and QS are perpendicular to PC and QS = 9 cm, what is the length (in...
The volume of cone is 1617 cm3. If its height is 3.5 cm then find the radius of the cone.
The length, breadth and height of a solid cuboidal box are in the ratio 7 : 5 : 3 and its total surface area is 11502cm2. Its breadth is:
A box has 80 Red, 40Blue and 40 Black Balls. 25% of Red Balls and 50% of Blue Balls are taken away, percentage of Black balls at present is
If the length of a rectangle becomes double and its breadth becomes three-fourth, then find the percentage increase in its area.
A rectangular tank is 50 meter long and 29meter deep. If 1000 cubic meters of water be drawn off the tank, the level of the water in the tank goes down ...
A sphere is melted and recast into 64 smaller spheres of equal size. If the radius of the original sphere is 16 cm, find the radius of each smaller sphere.
Find the volume of a cylinder of radius 7 cm and height 10 cm. (Take Ο = 22/7)
A circular field has an inner radius of 7 metres. A path of width 14 metres surrounds the field. Find the cost of cementing the path at the rate of Rs....
Relevant for Exams:
