Question
A does 55% of some work in 12 days. Later, with B’s
help, she completes the remaining work in 4 days. In how many days can Be B complete the entire work alone? type-sscSolution
Let total work = 120 units A does 45% of the work=120×45/100=36 Since A does 45% of the work (i.e. 36 units) in 12 days, A = 36/12 = 3 units per day Work left = 120 − 36 = 84 units Let B do x units of work per day. B and A finish the pending work in 4 days. ∴ 4(x + 3) = 84 ∴ 4x = 84 − 12 = 72 i.e. x = 18 units ∴ Time taken by B to complete the work = 120/18 = 6+2/3 
days
A class of 30 students appeared in a test. The average score of 12 students is 80, and that of the rest is 75. What is the average score of the class?
- The average of 9 scores is 45. If two new scores are added and their average is 'x', the overall average becomes 20% more than the previous average. Find t...
In an examination the average marks of Rohit is 65. If he got 15 more marks in science and 25 more marks in maths then his average would have been 70. F...
- The average weight of 35 boxes is 24.8 kg. After removing 5 boxes, the average weight becomes 26.1 kg. Find the average weight of the boxes that were remov...
- Find the square of 'x' if the average of 22, 31, 49, 38, 29, and 'x' is 40.
In an examination, Aryan scored 54% marks and passed by 98 marks, while Rohit scored 35% marks and failed by 35 marks. Determine the passing marks for t...
The average score of a class of boys and girls in examination is X. The ratio of boys and girls in the class is 4:3. If the average score of the boys (X...
In a school, the average number of books that some numbers of boys have is 80 and average number of books that some numbers of girls have is 50. If each...
The average of six numbers is 8. When three new numbers are included in such a way that the first number is  twice the second and second number is thri...
Average run scored by a batsman in first ‘x’ matches is 70. In next 12 matches he scored runs with an average of 90 so that his overa...
Relevant for Exams:
