Question
‘A’ and ‘B’ can do a piece of work in 20 days
and 25 days, respectively. If they started the work together and worked on it for 4 days, then find the time taken by ‘B’ alone to complete the remaining work.Solution
Let total amount of work be 100 units Efficiency of ‘A’ = 100/20 = 5 units/day Efficiency of ‘B’ = 100/25 = 4 units/day Amount of work done by ‘A’ and ‘B’ together in 4 days = (5 + 4) × 4 = 36 units Time taken by B to complete remaining work = (100 – 36)/4 = 16 days
- The inner radius of a hollow cylindrical tank is 6 cm. If the height of the tank and the thickness of the walls are 25 cm and 3 cm, respectively, calculate...
The perimeter of a sector of a circle, whose radius is 17 cm, is 63 cm. If the length of a rectangle is 10 cm more than the arc subtended by the sector ...
Ratio of length to width of a rectangular field is 2:3. If the perimeter of the field is 380 metres, then find the area (in m2) of the field.
If the length and breadth of a rectangle are in the ratio 4:3 and its perimeter is 28 cm, then the area of the rectangle (in cm²) is :  Â
Perimeter of a square and circumference of a circle are in the ratio 9:11, respectively. If area of the square is 81 cm2, then find the radiu...
In a two cylinders the ratio of the radius of the two cylinders is 2:3 and their heights are in the ratio 5:3, then what will be the ratio of their volu...
- The sides of a cuboid are in the ratio 1:2:4. If its volume is 1728 cm³, find the sum of its dimensions.
Four circles of equal radii are described about the four corners of a square so that each touches two of the other circles. If each side of the square i...
The perimeter of a square field is 12 cm more than the perimeter of a rectangle. The length of the rectangle is 40 cm which is 200% of its width. If a s...
- A cargo container has dimensions 25 metres in length, 12 metres in breadth and 10 metres in height. If each wooden crate occupies 100 m³, how many wooden ...
Relevant for Exams:
