A company has 21 employees consisting of regular workers, vice presidents and one president. All of the employees chip in money for a charity drive. Regular workers pay Rs 70 each, vice presidents pay Rs 170 each and the president pays Rs 300. If the company collects Rs 2000 in all, how many regular employees are there?
17
If r- regular employee, v- vice president, p- president, then we have: r+v+p=21 ------------> (1) 70r+170v+300p=2000 => 7r+17v+30p=200 ------------> (2) (2)- 7*(1) => 10v+23p=53 ------------> (3) It is obvious that v=3, p=1, then r=21-1-3=17
How many triangles are there in a regular pentagon with all its diagonals drawn?
Note: a regular pentagon has five straight sides all of the same length and five equal angles. A diagonal is a line joining points.
There are 501 million workers in organized and unorganized sectors in India. The ratio of female and male employee is 1:3 skilled male employees are 51/5 times that of unskilled female employees. Is 15% male employees are unskilled, then what is the number of skilled female employees?
A construction company employs 60 men to build a bridge of 500 m in 30 days working 8 hours a day. If in 24 days they completed 3/5 part of work, then how many more employees should be hired to finish the work in time, working 10 hours a day?
On a regular 12-hour digital clock how many times would the same three digits in a row be displayed (e.g. 1:11,11:12,12:22) in one day?
From a square with sides of length 5 cm, triangular pieces from the four corners are removed to form a regular octagon. Find the area removed?
