Question
A and B can together complete a task in 18 hours. After
6 hours A leaves. B takes 36 hours to finish rest of the task. How many hours would A have taken to do the task if he worked alone?Solution
Let the total number of units of work =108 A and B can do in 18 hours so 108/18 =6 units each hour they both can do 6 units For 6 hours they both worked and so 36 units is done so 108-36=72 units of work is done by B alone in 36 hours I.e 72/36 = 2 units per day Therefore a+b=6 a=6-2 a=4 units per day If A worked alone then 108/4 =27 hours
The ratio of the present age of A to that of B is 7:9. Six years ago the ratio of 1/3 of A’s age at that time and 1/3 of B’s age at that time was 1:...
Mohit is 4 years older than Nittu. The present age ratio of Nittu to Pawan is 11:6. Additionally, Mohit's current age is twice that of Pawan's. Based on...
- Five years ago, the ratio of age of 'A' to 'B' was 4:5. After ten years, the ratio of age of 'A' to 'B' will be 7:8. Find the current age of 'C' who is 6 y...
Two years from now, Pankaj's age will beÂ
The current average age of Sohan, Mohan, and Rohan is 30 years. 10 years from now, the ratio of the ages of Sohan and Mohan will be 17:16 respectively, ...
The age of A is 40% less than that of B. The age of B is 15 years more than the average age of his two friends whose total age is 20 years. Find the dif...
The ratio of the present ages of father and his son is 9:5. The product of their ages 3 years ago was 33 times of his son’s age that year. What wa...
Average of present age of A and C is 29 years and C is 8 years younger than B. Ratio of present age of A to present age of B is 6:5. Find present age of B.
The present age of A is 5/3 times to that of his marriage age. Present age of his brother is 1/3rd of his present age. If A was married 24 years ago the...
Nine years ago, the ratio of ages of Raj and Vijay was 5:7, respectively. Four years hence, the ratio of ages of Sanjay and Vijay will be 2:3, respectiv...