Time & Work Mcqs

Q.  A and B can do a piece of work in 21 and 24 days respectively.They start the work together and after some days, A leaves and B completes the rest of the task in 9 days. After how many days did A leave?

a. 5
b. 6
c. 7
d. 8


ANSWER: See Answer
 
Part of work completed by A in a day = 1/21 Part of work completed by B in a day = 1/24 Part of work completed by them together in a day = (1/21)+(1/24)
= 5/56 Part of work completed by B in 9 days
= 9/24 = 3/8 If A left after x days,
(5x/56)+(3/8) = 1
x = 7
MCQs:  A and B together take 6 days to complete a task. B and C together take 12 days to complete the same task. A and C together take 8 days to complete it. If A, B and C are working together, how long does it take for them to complete the task?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A, B and C can do a piece of work in 20, 30 and 60 days respectively. In how many days can A do the work if he is assisted by B and C on every Third day ?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A and B together can complete a work in 1.2 days,. A alone can complete it in 20 days. If B does the work only for half a day daily, then in how many days A and B together will complete the work ?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  X and Y can do a piece of work in 20 days and 12 days respectively. X started the work alone and then after 4 days Y joined him till the completion of the work. How long did the work last ?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  Twenty women can do a work in sixteen days. Sixteen men can complete the same work in fifteen days. What is the ratio between the capacity of a man and a woman ?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A and B can do a piece of work in 72 days; B and C can do it in 120 days; A and C can do it in 90 days. In what time can A alone do it ?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A and B can complete a work in 15 days and 10 days respectively. They started doing the work together but after 2 days B had to leave and A alone completed the remaining work. The whole work was completed in___________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A can do a certain work-in the same time in which B and C together can do it. If A and B together could do it in 10 days and C alone in 50 days, then B alone could do it in_________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A and B can do a work in 8 days, 13, and C can do the same work in 12 days. A, B and C together can finish it in 6 days. A and C together will do it in_________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The population of a town increased from 1,75,000 to 2,62,500 in a decade. The average percent increase of population per year is:________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  Ramees buys good worth Rs. 6650. He gets a rebate of 6% on it. After getting the rebate, he pays sales tax @ 10%. Find the amount he will have to pay for the goods.
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  Ghafoor went to the stationers and bought things worth Rs. 25, out of which 30 paise went on sales tax on taxable purchases. If the tax rate was 6%, then what was the cost of the tax free items?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  Two tailors X and Y are paid a total of Rs. 550 per week by their employer. If X is paid 120 percent of the sum paid to Y, how much is Y paid per week?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  Three candidates contested an election and received 1136, 7636 and 11628 votes respectively. What percentage of the total votes did the winning candidate get?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The tank full of petrol in Haroon’s motorcycle lasts for 10 days, if he starts using 25% more every day for how many days will the tank full of petrol last?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  If Mobeen while selling two goats at the same price makes a profit of 10% on one goat and suffers a loss of 10% on the other, he
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A gardener increases the area of his rectangular garden by increasing its length by 40% and decreasing by 20%. The area of the new garden?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  If the price of petral is increased by 20% by what percentage should the consumption be decreased by the consumer if the expenditure on petrel remains unchanged?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  In a survey it was found that 80% of those surveyed owned a car while 60% of those surveyed owned a mobile phone, if 55% owned both a car and a Mobile phone, What percent of those surveyed owned a car or a mobile phone or both?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  Two numbers X and Y are respectively 20% and 28% less than a third number Z. By what percentage is the number Y less than that of the number X?
Category: Mathematics Quizzes,   Published by: T-Code Scripts