Question
P, Q and R can do some work in 11 days, 20 days and 55
days respectively. In how many days can the work be done, if P gets the assistance of Q and R on alternate days?Solution
Let, total work = (LCM of 11, 20, and 55) = 220 efficiency of P = 20 units Efficiency of Q = 11 units Efficiency of R = 4 units Work done by P and Q in first day = 20 + 11 = 31 Work done by P and R in second day = 20 + 4 = 24 Total work done by P, Q, and R in 2 days = 31 + 24 = 55 55-unit work done by all three in = 2 days  220-unit work done by all thee in = [2/55] × 220 = 8 days.
In a mayoral election between two nominees, 20% of the total votes were rejected as invalid. Out of the valid votes, 65% went to the winning candidate, ...
In 2021, Ravi's income was Rs. 18,000, out of which he spent 35% and saved the rest. In 2022, if Ravi's income increased by 15% a...
Hari scored 70 marks in English. He scored 64% marks in Hindi and X marks in Maths. The maximum marks for each subject is 175. The overall percentage of...
A man spent 30% of his income in May. If his savings is increased by 30% in June and becomes Rs. 9100, then find the income of man in May.
- A laptop’s price increases by 7% annually. If its present price is ₹50,000, what will be the price after 2 years?
In a mixed school 25% of the scholars are infants under 7 and the number of girls above 7 is 4/5 of the number of boys above 7, and amounts to 120. Find...
A invested a certain amount in Debt and Equity mutual funds in the ratio of 3: 7 respectively. At the end of one year, he earned a total dividend of 30%...
What is the percentage change in the result when we add 36 to a certain number x, instead of subtracting 36 from the same number x?
In a school, 30% of the students are not participating in any competition. 80% of the students who are participating in the competition are girls. If 42...
Kalpana allocates 30% of her monthly income to educational expenses and spends 60% of what remains on clubbing activities. If she spends Rs. 3024 on clu...
Relevant for Exams:
