Question
Three workers W1, W2 and W3 got work from the
contractor. In 5 days, ‘W1’ completed 25% of work. ‘W2’ is 20% less efficient than ‘W1’ but takes 5 days less than ‘W3’ to complete the work alone. Find the time taken by all three together to complete 74% of work.Solution
Time taken by ‘W1’ to complete the work = 5/0.25 = 20 days Time taken by ‘W2’ to complete the work = 20/0.2 = 25 days Time taken by ‘W3’ to complete the work = 25 + 5 = 30 days Let the total work = 300 units (LCM of 20, 25 and 30) Efficiency of ‘W1’ = 300/20 = 15 units/day Efficiency of ‘W2’ = 300/25 = 12 units/day Efficiency of ‘W3’ = 300/30 = 10 units/day Required time taken = (0.74 × 300)/37 = 6 days
The average number of books read by 40 Indian students in a year is 30. If the books read by their librarian are included, the average increases by 2 bo...
The average age of a group of 80 students is 14 years. If 3 students whose ages are 16 years, 22 years, and _____ years are replaced by 3 new students w...
"In a group of four investors in stocks, the highest earner makes Rs. 5 lakh per month, while the lowest earner makes Rs. 2.4 lakh per month. Now, we wa...
The average of series 'S5', which consists of 6 consecutive even numbers, is 23. The second term of series 'T5', which consists of 5 consecutive odd num...
Deepak spends an average of Rs. 520 on Sundays and Rs. 340 on the remaining days. Find his average spending in a 30-day month starting with Sunday.
The average of 12 numbers is 28. If one number 34 is replaced by 58, find the new average.
The average electricity consumption of a household over a number of months was 180 units. In the next month, it consumed 300 units, raising the average ...
The average number of taxis of three colours (black, white and yellow) in a taxi stand is 150. The number of black taxis is 50 more than that of yellow ...
Average weight of a team of 18 persons is 40 kg. When one more person joins the team, the average weight of the team increases by 4 kg. Find the weight ...
The average expenditure of a man for the first 4 month is Rs.4000 and for the next 8 months is Rs.6000. If he saves 11000 in that year then find his ave...
