The square of one-sixth of the number of students in a class are studying in the library and the remaining eight students are playing in the ground. What is the total number of students of the class ?
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Two thirds of eth students in a class are boys and the rest girls. It is known that eh probability of a girl getting a first class is 0.25 and that of
Correct Answer - `0.27` We have `P(G)=1//3and P(B)=2//3` ` P(A//G)=0.25and P(A//B)=0.28` Here, A is the event that student chosen will get a first class. So, using total probability theorem, `P(A)=P(B)P(A//B)+P(G)P(A//G)` `2/3xx0.28+1/3xx0.25=0.27`
2 Answers 1 views
A class consists of 80 students, 25 of them are girls and 55 are boys. If 10 of them are rich and the remaining are poor and also 20 of them are intel
Correct Answer - C Total number of the students is 80. Total number of boys is 55. Therefore are 10 rich, 70 por, 20 intelligent students in the class. Therefore, required...
2 Answers 1 views
The ratio of the number of students in schools X and Y is 4:7. if 15 students from Y join X, then the ratio becomes 1:1. What is the total number of s
Correct Answer - 110
2 Answers 2 views
Ravi earned a sum of Rs. 10800 and donated `40%` of it to charity. He give `15%` of the remaining amount to Ramu. After giving `25%` of the remaining
Correct Answer - 4131
2 Answers 5 views
A class has `175` students. The following data shows the number of students obtaining one or more subjects : Mathematics `100`, Physics `70`, Chemistr
Correct Answer - `60`
2 Answers 1 views
Anthony spends `x%` of his salary towards expending on food , 2x% of the remaining on transport 3x% of the remaining towards various bills 4x% of the
Correct Answer - `F,T,I,R`
2 Answers 1 views
A profit of Rs. 300 is made on class I ticket , and Rs. 800 is made on class II ticket. If x and y are the number of tickets of class I and class II s
Correct Answer - f=300x+800y
2 Answers 1 views
In a class of 80 students, 55 students passed in mathematics and 60 passed in chemistry. 10 stu-dents failed in both mathematics and chemistry. (i) Ho
Correct Answer - (i) 45 , (ii) 25
2 Answers 1 views
A class has `175` students, The following description gives the number of students studying one or more of the subjects in this class, Mathematics `10
Correct Answer - (i) 60,35,13, (ii) 32
2 Answers 1 views
The mean weight of 25 students of a class is 52 kg. if the mean weight of the first 13 student of the class is 48 kg and that of the last 13 students
Correct Answer - 39 kg
2 Answers 1 views