There are 1224 students in a school in which 600 are girls. What is the ratio of boys to girls in the school?

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

Let U be the set of all students who took part in the survey. Let T be the set of students taking tea. Let C be the set of students taking coffee. Accordingly,...

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...

Girls’ school had a central courtyard where girls played in total seclusion and safety from the outside world. The boys school had no such courtyard.

(b) Let the number of girls in the school be = 100 Number of boys = 124 Required ratio = 124 : 100 = 31 : 25

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 =...

(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...

(d) Total number of students in the school = 819 Number of girls = 364 Number of boys = 819 - 364 = 455 Required ratio = 435 : 364 = 5 :...

(e) Let the number of girls = x  Number of boys = 1.16 x Required ratio = 1.16 x : x      = 116 : 100 = 29 : 25

(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 =...