Question
In a college the ratio of boys and girls are in the
ratio 7:9. 65% girls and 40% boys were absent. Find the girls present if the total number of students in a college were 320.Solution
Boy: Girl = 7:9 Total number of students = 320 Number of Boys = (7/16) × 320 = 140 Number of Girls = (9/16) × 320 = 180 Number of girls absent = 65% × 180 = 117 Number of boys absent = 40% × 140 = 56 Total number of girls present = 180 – 117 = 63
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...
10 rotten bananas are accidentally mixed with 140 good ones. It is not possible to just look at a banana and tell whether or not it is rotten. One banan...
What will be the probability of choosing one red and one green ball from a basket containing 4 red and 5 green balls if two balls are drawn randomly?
Three houses are available in a locality. Three persons apply for the houses. Each applies for one house without consulting others. The probabili...
John is answering a survey with 3 questions, each with 2 options. Only one option is correct per question. If John answers randomly, what is the probabi...
What is the probability that a number selected from 1,2,3.......................68,69,70, is perfect square or a perfect cube?
A box contains 8 yellow marbles, ‘x’ blue marbles and 12 white marbles. A box contains 5 yellow marbles, 2 blue marbles and 3 white marbles. The pro...
A box contains 5 red, 6 green and 3 yellow balls. 2 balls are drawn at random. What is the probability that they are not of the same colour?
The probability of selecting a rotten egg randomly from a basket of 250 eggs is 0.2. What is the number of rotten eggs in the basket?
A bag contains 13 white and some black balls. If the probability of drawing a black ball from the bag is 3 times that of drawing a white ball, find the ...
