Question
A can complete 5/6 of a work in 15 days and B can
complete 2/3 of work in 8 days. In how many days both A and B together can complete the work?Solution
A completes 5/6 units in 15 days A completes 1 unit in 15 x (6/5) = 18 days B completes 2/3 unit of work in 8 days B completes 1 unit of work in 8 x 3/2 = 12 days LCM of 12 and 18 = 36 units A's efficiency = 3 units/day and B's efficiency = 2 units/day A and B will complete the whole work in (total work)/efficiency of (A + B) = 36/(3 + 2) = 7(1/5) days
My sister is 5 years elder to me. My father was 30 years of age when my brother was born while my mother was 28 years of age when I was born. If my bro...
Rishav's current age is 25% more than Sourav's current age. In 8 years, the ratio of their ages will be 5:6. What will be Rishav's age 10 years from now?
The average age of A, B and C is 40 years, while the average age of B, A and D is 30 years. If the ratio of the age of C and D is 5:3, respectively, the...
A girl’s age is 125% of what it was 10 years ago, but 75% of what it will be after 10 years. What is her present age?
Four years from now, the age of 'A' will be 60% of the age of 'B' at that time. The combined present ages of 'A' and 'B' exceed the current age of 'C' b...
When 15 years ago age of Dev was divided by 20, the present age of his granddaughter Swati is obtained. If Swati is 6 years younger than her sister Neha...
Aarav's current age is 6 years less than the total of 30% of Neel’s age and 50% of Tarun’s age. If Neel is 70 years old and Tarun is 40 years old, h...
The age of A is 20% less than that of B. The age of B is 25 years more than the average age of his two friends whose total age is 30 years. Find the dif...
Sum of the present ages of A, B, C and D is 56 years. After 3 years ratio of their ages is 7:6:5:2. What is C’s present age?
The ratio of age of ‘B’ after 7 years from now and age of ‘C’ 4 years ago from now is 7:4, respectively. The present age of ‘C’ is 30% of th...
Relevant for Exams:
