Question
A, B, and C together can complete the assignment in 8
days. B and C together take (48/5) days, and C alone completes half in 8 days. Find the ratio of the efficiency of A to B.Solution
1/A + 1/B + 1/C = 1/8 C alone complete the whole work = 8 × 2 = 16 days B and C together = (48/5) days ⇒ rate = 5/48 1/A = 1/8 – 5/48 = (6 – 5)/48 = 1/48 1/B = 5/48 – 1/16 = (5 – 3)/48 = 2/48 = 1/24 A alone complete the work = 48 days B alone complete the work = 24 days Required ratio = (1/48) : (1/24) = 1 : 2
- The average of four numbers is 58. When four more numbers are included, the average increases by 4. Find the average of the numbers included.
Ram scored an average of 5 goals per match in his first four games. However, he didn't score any goals in the following three matches. How many goals do...
The average of five positive numbers is 56. If the first number is three-fourth of the sum of the last four numbers, then the average of the last four n...
Average of 8 numbers is 70. If average of first four and last two numbers is 50 and 60, respectively then find the fifth number given that ratio of fift...
The average marks scored by 45 boys and 55 girls are 78 and 84 respectively. Find the average marks scored by all the students together. (Answer should ...
- The average value of the property of Pooja, Sahil and Ramesh is Rs. 66 lacs. The value of the property of Pooja is Rs. 12 lacs less than that of Sahil, and...
If average of first 12 numbers is (n – 23) and the sum of remaining number is 925. Find the value of ‘n’, if the average of 22 numbers is ‘n’....
The average wage of a group of 44 labourers is Rs. 250. If 4 persons receiving average wage of Rs. 275 leave the group and 2 persons receiving average w...
The average age of a category of 5 members is 40 years. If a person whose age is 60 years will left the group and two new persons whose age is 'a' years...
The average age of three children is 22 years. If their ages are in the ratio 2:4:5. Find the age of the youngest child.
Relevant for Exams:
