Question
βAβ and βBβ can build a wall in 8 days and 12
days, respectively. If βAβ started building the wall alone but after 4 days he was replaced by βBβ, then find the total time taken to build the wall.Solution
Let total work be 24 units = LCM of (8 and 12)Efficiency of βAβ = 24/8 = 3 units/dayEfficiency of βBβ = 24/12 = 2 units/dayTotal work done by βAβ in 4 days = 4 Γ 3 = 12 unitsTime taken by βBβ to build rest of the wall = {(24 β 12)/2} = 6 daysTotal time taken = 6 + 4 = 10 days
At the time of their marriage, the ratio between the ages of Reena and Rahul was 9:10 respectively. After βyβ years of their marriage, a daughter wi...
Six years ago, the age of 'R' compared to the age of 'M' six years from now was in the ratio 4:7. If the current average age of 'R' and 'M' is 33 years,...
At the time of 'Binny's birth, the age of 'Ankush' was twice the present age of 'Binny'. Fourteen years from now, if the ratio of their ages is 25:13, f...
Five years ago, the ratio of Aman's age to Rahul's age was 6:5. It is also known thatΒ Aman's age will be 47 years five years from now. Additionally, R...
The ratio between the present age of Beena and Meenal is 4:7, where Sumit is 6 years younger than Meenal then find the ratio of their ages 8 years hence.
- The present age ratio of X and Y is 5:9. After 6 years, the ratio will become 7:11. Find the present age of X.
Shalini is younger than Rashi by 3 years. If the ratio of Shalini and Rashi ages is 5:6 respectively, then find the age of Shalini.
12 years back, Abhishek and Bheema had their ages in the ratio of 4:5. Currently, the average of Bheemaβs and Chintuβs ages i...
The current age of Derek is twice that of Eve. 7 years from now, Derek's age will be 1.5 times the age of Fred at that time. If Eve is 5 years younger t...
If the ratio of the ages of Karan and Saroj is 5 : 7. 8 years ago, the ratio of their ages was 2 : 3. Find the present age of Saroj?