Question
The average height of each person in group 'C' having 25
people is 10 cm less than the average height of each person in group 'D' having 20 people. If the sum of the heights of all people in group 'C' is the same as that in group 'D', then what is the average height of a person in group 'D'?Solution
ATQ, Let the average height of a person in group 'D' = 'y' cm. Then, the average height of a person in group 'C' = (y - 10) cm. Total height of all people in group 'D' = 20 × y = '20y' cm. Total height of all people in group 'C' = 25 × (y - 10) = 25y - 250 cm. So, 25y - 250 = 20y. Or, 5y = 250. So, y = 250 / 5 = 50. Required average height = 50 cm.
The Vigyan Dhara scheme has been allocated a proposed outlay for which Finance Commission period?
Which of the following Mughal Emperor introduced the concept of square Persian-styled gardens in Agra?
Which Guru of the Sikh religion was executed by Aurangzeb?
In which year was the Rajiv Gandhi Khel Ratna Award, now known as the Major Dhyan Chand Khel Ratna award, instituted?
Who has been appointed as the New Lieutenant Governor of Delhi?
_________ is the author of the famous book “The Discovery of India”?
Who ruled over Kashmir from 980 to 1003, known by the title 'Didda'?
Which of the following is known as the Old Stone Age?
When do we observe World Wetlands Day?
As per the Forest Survey of India, What is the total area under mangrove cover ?
Relevant for Exams:
