Question
The average of 16 numbers is 36.5. If four numbers of
average x are added to them, then the average of all numbers increases by one. Find the value of x?Solution
Average of 16 numbers is =36.5 total of 16 numbers =36.5×16 =584 If four numbers of average =x total of 4 numbers = 4x ATQ- after Average increase by 1 (584+4x)/20 = 37.5 584+4x =37.5×20=750 4x = 166 x = 41.50
A solid cone is placed inside a solid hemisphere, both having the same radius and height. If the volume of the cone is 150 cm³, find the total volume o...
A cylindrical tank has a radius of 7 meters and a height of 10 meters. How many liters of water can it hold? (1 cubic meter = 1,000 liters)
A rectangular garden is bordered by a walkway of uniform width 5 metres. If the total area of the walkway is 1350 m², find the perimeter of the actual ...
A solid metallic rectangular block of dimensions 112 cm × 44 cm × 25 cm is melted and recast into a cylinder of radius 35 cm. The curved surface area ...
A hollow cylindrical tube 20 cm long is made of iron and its external and internal diameters are 8 cm and 6 cm respectively. The volume (in cubic cm) of...
Ali the barber shaved 32% of his customers and gave a haircut to 64% of his customers. He charged Rs. 6 for a shave and Rs. 4 for a haircut. If 15% of c...
Three metallic cubes whose sides are 15 cm, 20 cm and 25 cm respectively are melted and converted into a single cube. If there is no loss of metal in t...
The outer radius of a hollow metallic spherical ball is 12 cm while the thickness of the metal used to make it is 6 cm. Find the volume of the metal use...
If base of a prism is square of side 5 cm & height is 30 cm . What is the volume of prism?
The area of a trapezium is 960 square metres and the parallel sides are 60 m and 36 m. What is the perpendicular distance between these two sides?
Relevant for Exams:
