In a class there are 10 boys and 8 girls. The teacher wants to select a boy and a girl to represent the class in a function. In how many ways can the teacher make this selection?
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The number of boys and girls in a class are in the ratio 7:5.The number of boys is 8 more than the number of girls. What is the total class strength?
Let the no. of girls be 5x No. of boys=7x According to the question 5x+8=7x 7x-5x=8 2x=8 x=8/2 x=4 No. of girls=5*4=20 no. of boys=7*4 or 5*4+8=28 Hence the total strength of the class is 20+28=48
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2 boys and 2 girls are in Room X, and 1 boy and 3 girls in Room Y. Specify the sample space for the experiment in which a room
Let us denote 2 boys and 2 girls in room X as B1, B2 and G1, G2 respectively. Let us denote 1 boy and 3 girls in room Y as...
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In a family, having three children, there may be no girl, one girl, two girls or three girls. So, the probability of each is 1/4.
False, because the outcomes are not actually, likely. For no girl, the outcome is bbb, for one girl, it is bgb, gbb, bbg, for two girls, it is bgg, ggb, gbg and...
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Make a list of toys and games that boys typically play and another for girls. If there is a difference between the two lists,
List of toys and games that boys play with: cars, guns, swords, buses, railway trains, lions, etc. (toys), cricket, kabaddi, hockey, football etc. (games). List of toys and games that...
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In a class there are 10 boys and 8 girls. The class teacher wants to select a student for monitor of the class.
The teacher can select a student for monitor in two exclusive ways (i) Select a boy among 10 boys, which can be done in 10 ways OR (ii) Select a girl among...
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In how many ways can 5 boys and 5 girls be seated at a round table no two girls may be together ?
Leaving one seat vacant between two boys may be seated in 4! ways. Then at remaining 5 seats, 5 girls any sit in 5! ways. Hence the required number =...
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4 boys and 2 girls are to be seated in a row in such a way that the two girls are always together. In how many different ways can they be seated?
(d) Assume the 2 given students to be together (i.e one]. Now there are five students. Possible ways of arranging them are = 5! = 120 Now, they (two girls) can arrange themselves...
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There are 1224 students in a school in which 600 are girls. What is the ratio of boys to girls in the school?
(a) Total number of students = 1224 Total number of girls = 600 Total number of boys = 1224 - 600 = 624 Required ratio = 624 :600 = 26 : 25
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In a test, minimum passing percentage for girls and boys is 30% and 45% respectively. A boy scored 280 marks and failed by 80 marks.
(a) Total marks in the test = (280 + 80) x 100 /45 = 800 Passing marks for girls = 800 x 30/100 = 240 Required marks = 240 – 108 = 132
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In a class of 60 students, where the number of girls is twice that of boys, Kamal, a boy, ranked seventeenth from the top.
(b) Let the number of boys be x, then numbers of girls = 2x x + 2x = 60; or 3x = 60; or x = 20 So numbers of boys =...
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