Let total amount work be = 44 x 20 = 880 units Amount of work done by Q and R in 30 days = 30 x 13 = 390 units Amount of work left = 880 – 390 = 490 Required time = 490/7 = 70 days
A five digits number is chosen at random. What is the probability that all the digits are distinct, the digits at odd places are odd and the digits are ...
A bag contains 5 black balls,“a” white balls and “b” purple balls. If one ball taken out from the bag, then probability of being it white is 2/7...
A bag contains 12 black and 14 white balls. One ball is drawn at random. What is the probability that the ball drawn is white?
There are two bags P and Q. Bag P contains 5 Yellow and 6 Green balls while bag Q contains 6 Yellow and 5 Green balls. As a part of an experiment, a fai...
A box contains 6 Brown and 8 Blue caps. There is another box which contains 8 Brown and 7 Blue caps. One cap is to drawn from either of the two boxes. ...
A bowl contains 9 blue balls, 7 white, and 5 black balls. If 2 balls are drawn in one go, then the probability of exactly one ball being white is:
16 rotten bananas are accidentally mixed with 155 good ones. It is not possible to just look at a banana and tell whether or not it is rotten. One banan...
What is the Probability of getting a sum of ‘9’ on rolling a dice twice?
In a lottery, there are 4 prizes and 20 blanks. A lottery is drawn at random. What is the probability of getting a prize?
Roger Federer play 3 sets of a tennis match. The probability of his winning the three sets are 1/9,1/4,3/4 respectively. What is the probability that he...
