Question
In a school, the average height of the students of the
tenth standard is 100 cm. The average height of boys is 118 cm. whereas the average height of girls is 95 cm. What is the number of girls in the class if there are 20 boys?Solution
Average of total students' height =100cm. Average of 20boys height =118 Total height of 20 boys =118×20=2360cm Average of girls =95cm Let the number of Girls =x So the total height of x girls =95xcm. ATQ- (2360+95x)/20+x =100 2360+95x =2000+100x 5x =360 X =72.
Measure of each interior angle of a regular polygon can never be?
A pipe fills a cubical tank at the rate of 242 m3Â per minute in 44 minutes. If a cylindrical tank having height same as the side of a cubica...
The cost of fencing a rectangular field at the rate of Rs. 5/metre is Rs. 450. If the length of the field is 11 metres more than its breadth, then find ...
If the ratio of areas of two circle is 4:9, then the ratio of their circumferences will be:
Radius of a cylinder is increased by 20% and height reduces by 40% so what effect on the volume of cylinder?
The Height of a metallic hollow cylinder is 28 cm and the difference between its inner curved surface Area and outer curved Surface area is 66cm². If t...
The ratio of length to breadth of a rectangle is 10:13. If the sum of the length and breadth of the rectangle is 92 cm, then find the area (cm2
Find out the diameter of the incircle of a given triangle with a semi-perimeter of 24 cm and an area of 72 cm².
If the volume and radius of a cylinder is 4620 cm3 and 14 cm respectively then find the height of the cylinder?
Relevant for Exams:
