Question
In a school, the average number of books that some
numbers of boys have is 120 and average number of books that some numbers of girls have is 85. If each boy has 5 books then the average numbers of books with all the students become 100. The total number of boys is what percentage of the total number of students in that school?Solution
Let the total number of boys be x. The total number of girls be y. The total number of books boys have = 120x The total number of books the girls have = 85y If each of the boy have 5 books, then the remaining number of books = 120x – 5x = 115x The sum of the all the books = 100(x + y) = 115x + 85y y = x x : y = 1 : 1 Required % = (1/2) × 100 = 50%
An Urn has 120 Pink, 60 Green and 80 White Cards. 25% of Pink Cards and 50% of Green Cards are taken away, percentage of White Cards at present is
A girl found the answer for the question “subtract the sum 1/2 and 1/8 from unity and express the answer in decimals” as 1.5. The percentage of ...
A salesman is allowed 24% commission on the total sales by him and a bonus of 1% on the sales over Rs. 25000. If the total earnings of a salesman is Rs....
In a competitive exam, the passing percentage is 40%. Marks obtained by ‘A’ is 10% less than passing marks, and ‘B’ scores 20% marks less than A...
- If someone pays their gas bill before the due date, they receive a 20% discount. However, a person got only 17% discount and ended up paying Rs. 18 more. W...
The income of P is 30% more than Q, and the bonus of R is 100 more than the difference of incomes of P and Q. If R's bonus is 160, then find P's income.
Rakesh obtained 25% more marks than Ambuj Suresh obtained 40% less marks than Rakesh. Marks obtained by Suresh are what percent less than marks obtaine...
A man invested all his current month income in starting of a new business in which he spends 40% in advertisement 25% of remaining in furniture 20% of r...
A man spends 25% and 11% of his monthly salary on rent and transportation, respectively. Out of the remaining money, he spends 28% on food and 43% on en...
Monthly savings of ‘A’ is Rs. 1500 more than his monthly expenditure and his total monthly income is Rs. 4100. If his monthly income is increased by...
