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Given, 4th number:5th number = 2:3 Let, 4th number = 2x 5th number = 3x So, 3x – 2x = 14 Or, x = 14 Required average = {(40 + 14 × 2 + 14 × 3)/5} = (110/5) = 22
The names of 10 students from section A, 12 students from section B and 14 students from section C were selected. The age of all the 36 students was dif...
A box contains 5 blue jellies, some red jelly and rest yellow jelly. The probability of picking a red ball at random is 3/10, while the probability of p...
A fair coin is tossed 6 times. What is the probability of getting exactly either two or three heads?
A bag contains 7 blue balls, 3 red balls, and the rest are black balls. The probability of drawing a black ball from the bag is 4/9. How many black ball...
A bag contains x red, (x+4) blue, and (x+8) green balls. If the probability of getting a blue ball is 1/8 more than that of getting a red ball, then fin...
34 pens are there in a box where 10 are red pens, ‘p’ are blue pens and remaining are black pens. If a pen is picked, the probability of getting blu...
There are a total of 42 students (boys and girls) in a class. The probability of picking at least one boy when two students are picked from the class is...
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?
...From a bag containing 12 white and 15 yellow ribbons, find the probability of picking 2 ribbons of each type at random.
