Question
In a set of 10 data points, the average of the first three
numbers is 12 and the average of the last five numbers is 27. If the average of the 4th and 5th numbers is 15, calculate the average of all ten numbers.Solution
ATQ,
Average of all the 10 numbers = {(3 × 12) + (5 × 27) + (2 × 15)/10}
= {(36 + 135 + 30)/10} = 201/10 = 20.1
A and B together, B and C together and A and C together can complete a piece of work in 10 days, 14 days and 18 days respectively. Find the ratio...
- A man can complete a job alone in 20 days. A woman can complete half of the same job in 15 days. If both work together, how many days will it take them to ...
A team of 40 men is assigned to finish a project within 24 days. They began the task simultaneously. To complete the project 6 days ahead of the planned...
P works thrice as fast as Q, whereas P and Q together can work four times as fast as R. If P&Q and R together work on a job, in what ratio should they s...
A alone can finish the work in 10days and B alone can finish the same work in 15 days. All A, B and C together take 5 days to finish the work. Find the ...
4 girls working together for 1 day complete the same amount of work as 6 men working together for 1 day. The efficiency of 1 man ...
‘A’ can do a piece of work in 10 days. ‘B’ can do 80% of the same work in 20 days. If they work together for the entire time and get paid Rs.140...
Rohan can do a piece of work in 30 days. Rohan with the help of Karan does the same piece of work in 20 days. If they are paid Rs 3696 for the work, the...
A and B together can complete a task in 40 days, while A alone takes 100 days to finish it. When A, B, and C work together, they can complete the task i...
Ananya and Riya can complete a task in 20 hours and 40 hours respectively. Ananya works alone for 10 hours and then Riya finishes the remaining task. Ho...
Relevant for Exams:
