Question
A can do a work in 20 days, B can do in 30 days and C
can do in 60 days. If A is helped by B and C every third day. The number of days they will take to competed the work is:Solution
ATQ, The efficiency of A is 1/20 The efficiency of B is 1/30 The efficiency of C is 1/60 1st day work by A = 1/20 2nd day work by A = 1/20 3rd day work by A + B + C = 1/20 + 1/30 + 1/60 ⇒ (3 + 2 + 1)/60 = 1/10 Work completed in 3 days ⇒ 1/20 +1/20 + 1/10 = 1/5 Time is taken to complete the work ⇒ 3 × 5 = (1/5) × 5 ⇒ 15 days = 1 ∴ In 15 days the work will be completed.
The ages of A, B and C are in the ratio of 4:3:6 respectively. If the sum of their ages is 65 years, then find the age of B.
A bag contains Re 1 and 50 paise coins in the ratio 2 : 3. While the ratio of 50 paise and 25 paise is 4:5. If the total value of these coins is Rs 177....
- The ratio of the number of candies with Charu and Disha is 7:5. Disha's father gave her 4 more candies after while Charu stole 33(1/3)% candies possessed b...
Ratio between two numbers is 3:5 and their difference is 24. Find the sum of the given two numbers.
The marks obtained by X and Y in a quiz are in the ratio 7:5 respectively. If Y had scored 5 more marks, then the marks scored by X would be 30% more th...
In an office, the ratio of the number of males to number of females is 11:8. If 3 males joined the class and 6 females left the class, then the ratio of...
The ratio of the number of English books to Hindi books in a library shelf is 4:3. If 90 Hindi books are written by Pradeep, which constitutes 30% of th...
- If ‘A’, ‘B’ and ‘C’ are in proportion in the given order while ‘A’ = 16 and ‘B’ = 32, then find the value of ‘C’.
In a class of 140 students, the number of boys exceeds the number of girls by 8. If 4 additional girls and 6 additional boys join the class, what will b...
Relevant for Exams:
