The average age of a group of seven children is 10 years. From the group, two children, whose ages were 5 years more and 3 years more than the average age, left. Three new children, whose average age is 4 years more than the given average age, join the group. Find the new average age.
Initial sum of the ages of 7 children = 10 x 7 = 70 years Ages of the children leaving: 10 + 5 = 15 years and 10 + 3 = 13 years, Sum of the children leaving =15+ 13 = 28 years Sum of the ages after two children left = 70 - 28 = 42 years Sum of the ages of 3 new children = 10 + 4 x 3 = 42 years Total sum of the ages with new children = 42 + 42 = 84 years Number of children now = 7 – 2 + 3 = 8 New average age = 84/8 = 10.5 years
‘A’ and ‘B’ can complete a certain work in 18 days and 10 days, respectively. They started working together and worked till completion of the wo...
'Alex,' 'Ben,' and 'Charlie' can individually complete a task in 40, 60, and 100 days, respectively. They decide to work together, but there's a unique ...
12Men and 12women can complete a piece of work in 9 days. 6 men and 15 women can complete the same work in 12 days. How long (in days) would it take 9 w...
Naina and Kalpana working together can do a piece of work in 10 days, whereas Naina alone can do it in 12 days. In how many days can Kalpana do it alone?
P can do a piece of work in 15 days, Q can complete double the work in 40 days and R can do the work in 20 days. If all of them together earn Rs. 3000, ...
Amit and BK working together can finish a particular task in 90 days, while BK and Chiku working together can complete the same task in 70 days. Determi...
Ashish and Anil can do a piece of work in 20 days and 28 days respectively. Ashish completed 75% of the work. Find the time taken by Anil to complete th...
A and B working together completed a job in 40/9 days. If A had worked twice as efficiently as she did and B had worked 1/3 of his actual efficiency, th...
28 men can complete a work in 20 days. 40 women can complete the same work in 28 days. 20 men and 12 women started working and after 16 days, 20 more wo...
P and Q can separately finish the work in 15 days and 25 days respectively. They worked together and P left the work, so Q complete the remaining work i...
