Question
The average age of a class of 22 girls is 18 years. If 2
new girls having average age of 12 years join the class, then the average age of the class becomes:Solution
Total age of 22 girls = 22 × 18 = 396 years Total age of 24 girls = 396 + (2 × 12) = 420 years Therefore new average age = 420/24 = 17.5 years
‘A’ alone can complete a work in 40 days while ‘A’ and ‘B’ together can complete the same work in 20 days. How much ...
'A', 'B' and 'C', alone can do some work in 28 days, 35 days and 70 days, respectively. If they work together for wages of Rs. 6,600, then find the diff...
Suppose ‘n’ employees can process all the files in 50 days. If 10 more employees had participated, the work would be completed in 30 days. Find the ...
‘A’ can finish a project in 40 days, whereas ‘B’ finishes 50% of the project in 12 days less than ‘A’. How many days will it take both ‘A�...
P’s 4 days work is equal to Q’s 5 days work. If P and Q together can complete the work in 20 days then how much time Q will take to complete 40% of ...
Ravi and Rekha, alone can complete a work in 25 days and 50 days, respectively. They started the work together and left after 10 days such that the rema...
P and Q can complete a work in 30 days and 45 days, respectively. P, Q and R together can complete the work in 15 days. If R get a total wage of Rs. 540...
 P can do a work in 20 days, Q in 30 days. They work together, but P leaves 5 days before completion. Find total time.
- 45 people can repair a road in 10 days working 6 hours a day. In how many days can 30 people working 6 hours a day complete the same work?
Person A is 80% more efficient than person B. A and B together can complete a certain task in 10 days, while B and C together can complete the same task...
