The ratio of ducks and frogs in a pond is 35 : 43 respectively. The average number of ducks and frogs in the pond is 234. How many ducks are there in the pond?
The average of four numbers is 15. If the average of first three numbers is thrice the fourth number, then determine the fourth number.
The arithmetic mean of 9 numbers is 100 and the average of three of them is 40. What is the average of other six numbers?
In a company consisting of 20 employees, one employee retires and a new employee of age 23 years joins, resulting a decrease in average age of employees by 3. Find the age of retire employee.
In an engineering collage the average salary of all engineering graduates from Chemical trade is Rs. 2.45 lacs per annum and that of the engineering graduates from electronics trade is Rs. 3.56 lacs per annum, the average salary of all Chemical and Electronics graduates is Rs. 3.12 lacs per annum. Find the least number of Electronics graduates passing out from this institute.