Question
The average weight of A, B, C is 76 kg when D joins them
the average weight becomes 70 kg. If E whose weight is 2 kg more than D replaces A, then the average weight of B, C, D and E become 69 kg. Find the weight of A.Solution
Sum of weight of A, B and C = 76 × 3 = 228 kg Sum of weight of A, B, C and D = 70 × 4 = 280 kg Weight of D = 280 – 228 = 52 kg Weight of E = 52 + 2 = 54 kg Sum of weight of B, C, D, E = 69 × 4 = 276 kg Weight of (B + C) = 276 – 52 – 54 = 170 kg Weight of A = 228 – 170 = 58 kg
The cost of fencing a rectangular field at the rate of Rs. 14/metre is Rs. 1176. If the ratio of length to breadth is 4:3, find the area of the rectangu...
Length and breadth of a rectangular room are in the ratio 4 ∶ 5. The perimeter of the room is 180 m. Cost of flooring is Rs. 75 per square metre. Find...
- Find the height of a cone if its radius is 14 cm and curved surface area is 1320 cm².
The surface area of a right circular cylinder is 3,696 cm² and its radius is 14 cm. If the height of the cylinder is described as (k + 10), what is the...
The side of a cube is 4m more than the side of a square. If the ratio of lateral surface area of the cube and the area of the square is 9:1, then what w...
- A hollow cylindrical drum has an internal radius of 4.8 cm. If its length is 18 cm and the thickness is 2.5 cm, calculate the volume of the drum. (Use π =...
A solid metal sphere of radius 6 cm is melted and recast into solid hemispheres of radius 3 cm. How many such hemispheres are formed?
If the radius of a cylinder is 10 cm and its curved surface area is 550 cm2 then find the height of the cylinder?
The secant CD intersects the circle at E and CF is tangent to the circle at F. If the length of the secant CD is equal to 20 cm and the length of tangen...
