Question
Thirty men working 8 hours daily
complete a task in 16 days. If the work increases to three times the original and needs to be finished in 20 days by workers putting in 6 hours per day with a 20% increase in their efficiency, how many men are required?Solution
ATQ, Let the total work be 'W' units and eiciency of each man be 'E' units/hour Let the number of men required be 'M'. ATQ: {(30 X 16 X 8 X E)/W} = {(M X 20 X 1.2E X 6)/(3 X W)} Or, M = 80
The mean of a data set is 50 and the standard deviation is 10. What is the coefficient of variation?
The marks obtained by 15 students out of a maximum of 25 in a test are given as 13, 11, 16, 15, 18, 12, 13, 14, 10, 22, 21, 20, 17, and 24. Find the sum...
What will be the mode of the following data?
13, 15, 31, 12, 27, 13, 27, 30, 27, 28 and 16
In triangle ABC, G is the centroid. If CF, AD and 'BE' are medians on sides 'AB', 'BC' and 'CA' respectively, and area of triangle BGF is 24 cm2
What is the sum of the first 14 terms of an arithmetic progression if the first term is -21 and last term is 40?
The expenditure-to-savings ratio of an individual 'P' is 5:4. If the person's income rises by 25% and their savings increase by 3...
The average weight of a class of 25 student is 60 KG. If X is student joined the class,  than the average weight of whole class increases by (2X – 7...
5 years ago, A was 1/3 of B’s age. If the ratio of their present ages is 2:5, what will be the sum of their present ages?
18, 27, 54, 135, 400, 1417.5
The mean of 10 observations is 8. One more observation is added, and the new mean becomes 9. What is the value of the 11th observation?
