A student multiplied a number by 8/5 instead of 5/8. What is the percentage error in the calculation?
Let the required number = (LCM of denominator 5 and 8) = 40 According to the question, Wrong answer = 8/5 × 40 = 64 Correct answer = 5/8 × 40 = 25 Required percentage of error = (64-25)/25 × 100 = 156%
The ratio of efficiencies of X and Y for doing a certain work is 5 ∶ 9. Working together, they can complete a work in 15 days. X alone will complete 6...
P and Q can complete a work in 26 days and 39 days, respectively. P, Q and R together can complete the work in 13 days. If R get a total wage of Rs. 585...
'Ajeet' has an efficiency that is 40% lower than 'Chirag's, where as 'Bittu' is 20% more efficient than 'Chirag'. The time difference between 'Bittu' an...
‘A’ and ‘B’ can do a piece of work in 30 days and 40 days, respectively. They started working together but ‘A’ left after 9 days. Find the t...
‘A’ and ‘B’ can do a piece of work in 20 days and 40 days, respectively. If they started the work together and worked on it for 6 days, then fin...
P alone can finish a piece of work ‘M’ in 6 days while Q takes 3 days to finish it alone. P, Q and R working together can finish the work ‘N’ wh...
A contractor hired 80 workers to complete a work in 60 days. After 40 days, it was found that only half of the work was completed. Find the number of ex...
X can do a piece of work in 30 days. He worked at it for 5 days and then Y finished it in 20 days. In how many days can X and Y together finish the work?
8 children and 6 women together can complete a piece of work in 10 days and work done by a children in one day is one-third of the work done by a women ...
Abhay and Bhuvan working together can complete a sales target in 24 days. Bhuvan and Chikku working together can finish the same sales target in 32 days...
