A and B working together completed a job in 5 days. If A works twice as efficiently as he actually did and B works 1/3 of actual efficiency, the work would have completed in 3 days. Find the for A to complete the job alone.
A and B working together; can do a piece of work in 4.5 hours. B and C working together can do it in 3 hours. C and A working together can do it in 2.25 hours. All of them begin the work at the same time. Find how much time they will take to finish the piece of work.
A bacteria gives birth to two new bacteria in each second and the life span of each bacteria is 5 seconds. The process of the reproduction is continuous until the death of the bacteria. initially there is one newly born bacteria at time t = 0, the find the total number of live bacteria just after 10 seconds :
A bag contains 4 white, 5 red and 6 blue balls. Three balls are drawn at random from the bag. The probability that all of them are red, is
A bag contains 50 P, 25 P and 10 P coins in the ratio 5: 9: 4, amounting to Rs. 206. Find the number of coins of each type respectively.
A bag contains 6 black and 8 white balls. One ball is drawn at random. What is the probability that the ball drawn is white?
A bag contains an equal number of one rupee, 50 paise and 25 paise coins. If the total value is Rs. 35, how many coins of each type are there?
A bank offers 5% compound interest calculated on half yearly basis. A customer deposits Rs.1600 each on 1st January and 1st July of a year. At the end of the year, the amount he would have gained by way of interest is = ?
A banker discounts a 4 months bill at 3 %. If the proceeds be invested in a manner, so that nothing is lost, the interest rate should be
A basket contains 10 apples and 20 oranges out of which 3 apples and 5 oranges are defective. If we choose two fruits at random, what is the probability that either both are oranges or both are non defective?
