Question
A and B can finish a piece of work in 20 days and 30
days respectively. Both work on alternate days. In how many days will the work be completed when A starts the work?Solution
Both work alternately on alternate days. A starts first. Thus, 5 units can be worked in 2 days, so time taken to work 60 units = 60/5 =12 Days.
A company has 12 employees, including 8 engineers and 4 managers. The average salary of the engineers is E rupees, and the average salary of the manager...
In a seminar, the average number of male and female attendees is 540. 70% of males and 50% of females are professionals. If there are 588 non-profession...
The average of 7 numbers is 28. The average of first three of them is 23 and the last three of them is 42. Then the fourth number is:
The average price of two cars, namely 'M' and 'N' is Rs. 45,000 whereas the average price of cars 'N' and 'O' is Rs. 50,000. If the average price of car...
The average of three numbers is 21. The first number is double the second, and the third number is double the first. Calculate the sum of the first and ...
The average cost of three chairs is Rs.16000. The average cost decrease by 20% when one more chair is included. What is the cost price of the 4th
A gift box has 10 bangles. The average weight of the first 4 bangles is 56gms and the average weight of the remaining 6 bangles is 57 gms. Tell the aver...
In a class of 40 students, the average weight of the boys is 48 kg, and the average weight of the girls is 56 kg. If the overall average weight of the c...
The average age of a class of 27 girls is 18 years. If 3 new girls having average age of 8 years join the class, then the average age of the class becomes:
The average age of three children in a family is 35% of the average of the age of father and the eldest child. The total age of the mother and the young...
