Question
A, B, and C can complete a piece of work separately in
10, 20 and 40 days, respectively. In how many days will the work be completed if A is assisted by both B and C every third day?Solution
AÂ Â Â Â Â Â Â Â Â Â Â Â BÂ Â Â Â Â Â Â Â Â Â Â Â C 10Â Â Â Â Â Â Â Â Â Â 20Â Â Â Â Â Â Â Â Â Â 40 Â Â Â Â Â Â Â Â Â Â Â Â Â Â 40Â Â Â Â Â Â Â Â Â Â Total work 4Â Â Â Â Â Â Â Â Â Â Â Â 2Â Â Â Â Â Â Â Â Â Â Â Â 1Â Â Â Â Â Â Â Â Â Â Â Â Efiici The work of first 3 days =4+4+(4+2+1) =15units Similarly, the Next 3 days work=15units After 6days remaining work =40-(15+15) =10units 7days by A=4unit 8days by A=4units 9 days by A, B, C=2/7 Total days=8+2/7=58/7days.
"The average age of all employees in a company is 23.5 years. The average age of male employees is 25.2 years, while the average ...
The average age of 21 children is 30 years. 4 new children, whose average age is 15 years, join them. Find the average age of the 25 children. Â
The average age of 32 children and their teacher's age are 28 years. If the teacher's age is excluded, the average reduces by 1. What is the teacher's age?
Average age of company A is 28 years and average age of both companies A and B is 20 years. If the ratio of number of employees in company A and B is 3:...
The average of five even numbers is 60. If we replace two of these even numbers, 84 and 92, with a single even number X, the new average decreases by 4....
The average score of a student increased by 5 marks when he scored 210 marks in his 60th test. Find the average score of the student after 60 tests.
The average mark obtained by 140 candidates in a certain examination is 40. If the average marks of passed candidates are 55 and that of the failed cand...
The average salary of A, B and C is Rs. 22000 while average salary of B, C and D is Rs. 25000. If the average salary of D be 2 times of that of A, then...
The average of twelve numbers is 45.5. The average of the first four numbers is 41.5 and that of the next five numbers is 48. The 10th number...
The average age of X, Y, and Z is 25 years, and the average age of X and Y was 19.5 years at the time of Z's birth. If X is now 30 years old, determine ...
Relevant for Exams:
