Question
The mean of 12 numbers is 15. When two additional
numbers, x and y , are included, the average increases by 1. Given that the difference between x and y is 20, determine the value of y.Solution
Sum of 12 numbers = 12 X 15 = 180 Sum of 14 numbers = 14 X 16 = 224 So, x + y = 224 - 180 = 44 ----------(i) And, x - y = 20 -----------(ii) Solving (i) and (ii) , we get x = 32 and y = 12 Hence, option a.
A alone can do a piece work in 15 days and the time taken by A alone is 50% more than the time taken by B. They started work together alternatively star...
‘X’ can complete a job in 30 days. ‘Y’ is 50% more efficient than ‘X’. How long will they take to finish 75% of the work together?
...Vijay can do a piece of work in 32 days and Sanjay can do the same work in 48 days. If Vijay works for 2 days and got Rs. 960, and the remaining work wi...
A can fabricate a divider in 10 days , while B alone can assemble it in 30 days, If they construct it together and get an installment of Rs 8200, then f...
‘A’ and ‘B’ alone can do a certain work in 30 days and 40 days, respectively. Both started the work together but after ‘x’ days ‘A’ left...
Raju and Raman can complete a piece of work in 12 days and 16 days, respectively. If they work on alternate days, starting with Raju, in how many days w...
P alone can finish a piece of work ‘M’ in 8 days while Q takes 4 days to finish it alone. P, Q and R working together can finish the work ‘N’ wh...
‘A’ and ‘B’ can do a piece of work in 20 days and 30 days, respectively. If they started the work together and worked on it for 7 days, then fin...
A, B, and C are hired to complete a task. A and B together can finish the work in 12 days, B and C together in 15 days, and A and C together in 20 days....
- Person 'X' can finish a task in 40 days while 'Y' can do it in 50 days. How long will it take if both work together?
Relevant for Exams:
