The average of 4, 6, 8, 12 and x is 7 and the average of x, 9, 13, 15 and y is 9. What is the value of 2x – 3y?
The correct answer is D
The surface area of water in a swimming pool forms a rectangle with length 30m and breadth 12m. The depth of water increases uniformly from 1.4m to 2.6m...
The diameter of the base of a cylindrical drum is 14 cm and its height is 15 cm. The drum is full of water and the water from the drum is transferred to...
The ratio of length to breadth of a rectangle is 5:4, respectively. Perimeter of rectangle is 162 cm. If each side of a square is 25% more than the brea...
A rectangular ground is 85 metre long and 65 metre broad. If two 10 metre wide paths one parallel to the breadth and one parallel to the length, of theÂ...
The lateral surface area of a cube is 484 cm2 . The length of a cuboid is 10% more than the side of the cube. The breadth of the cuboid is 9 ...
If the volume of a cylinder is 144π and the ratio of radius to its height is 3:2 then find the curved surface area of cylinder?
Two equal vessels A and B contain 70% of milk and 60% of milk respectively and the remaining sugar. In which 30 kg of mixture is taken out from vessel A...
A square and a rhombus lie on a common base and the rhombus is inclined at an angle of 30° with the base. Find the ratio of the areas of the square and...
A gardener uses cylindrical roller of diameter 7 cm and length 28 cm to flatten a rectangular field of dimension 280cm × 165 cm. Find the number o...
John had to multiply 'a' by 'b'. He however multiplied 'a' by 22.5 and obtained 423 as the product. Selina also had to multiply 'a' by 'b'. She however ...
