CAT Exam

The number of studenis in 3 classes are in the ratio 2 : 3 : 4. If 12 students are increased in each class, this ratio changes to 8 : 11 :14. The total number of students in the three classes in the beginning was

Read Solution (Total 2)

36 + 54 + 72 = 162

At the beginning , number of students = 2x,3x,4x
After increasing,(2x+12),(3x+12),(4x+12)

2x + 12 = 8y -------(1)
3x + 12 = 11y ------(2)
4x + 12 = 14y

from (1) and (2),
=> x = 18

=> number of students in each class = 36,54,72
Total = 36 + 54 + 72 = 162
11 years agoHelpfull: Yes(10) No(0)

let the number of students are 2x,3x & 4x
(2x+12)/(3x+12)=8/11
22x+132=24x+96
2x=36
x=18
hence the number of students will be,
2x=2*18=36
3x=3*18=54
4x=4*18=72
11 years agoHelpfull: Yes(5) No(0)

CAT Other Question

16 litres of mixture contains milk and water in the ratio 5:3.if 4 litres of this mixture is replaced by 4 litres of milk,the ratio of water to milk in the new mixture will become: in a town,the population was 8000.in one year,male polpulatin increased by 10% and female population increased by 8% but the total population increased by 9%.the number of males in the town was: