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.
A sum is distributed among A, B and C is the ratio 8: 4: 3 and A divides its part between D and E in the ratio 9: 7, then what is the ratio of part of C...
A starts a business with Rs. 75,000 and B joins the business 5 months later with an investment of Rs. 80,000. After 1 year, they earn a profit of Rs. 4,...
Ratio between two numbers is 8:11 and their difference is 39. Find the sum of the given two numbers.
A bag contains certain number of coins of different denominations. The ratio of the number of Rs. 1 coins to Rs. 2 coins is 4 : 5, respectively and the...
In an institute, the average score on an IBACIO Scholarship test for 52 aspirants is 51. Excluding the scores of the top 5 performers, the average score...
The ratio of the two numbers is 7:15. 120% of the first number is equal to the 70% of the second number. Find the sum of both the numbers.
The ratio of the distances covered by Mohit, Soham, and Ramesh is 6:4:3 respectively. Ayush covers 12 meters less than Mohit. If the difference between ...
Two numbers are in the ratio 7:5. After adding 2 and 4 to them respectively the ratio becomes 2:3. Find the bigger number.
The number of students in a school is 3247. If the ratio between boys to girls is (x+3) : (x+4), then find the value of x.
The ratio of A’s salary to B’s salary is 3 : 5. If B’s salary is Rs 20,000, what is A’s salary?
Relevant for Exams:
