Question

69. The students in three classes are in each class in the ratio 2:3:5. If 40 students
are increased in each class the ratio change to 4 : 5: 7. Originally the total
number of students was-
a) 100
b) 180
c) 200
d) 400​

Answer 1

Answer:

C otion

because 2x+40+3x+40+5x+40 equal to 16x by calculate this we get x equal to 20 inetially we have 2x+3x+5x equal to 10*20 equal to 200

Answer 2

Step-by-step explanation:

Let the number of students In

First class be 2x

Second class be 3x

Third class be 5x

If 40 students are added in each class ...

(2x+40)+(3x+40)+(5x+40) will be the total

Then new ratio will be 4:5:7

Therefore , (2x+40)+(3x+40)+(5x+40) = 4:5:7

Let 4:5:7 be 4x , 5x , 7x

Hence, (2x+40)+(3x+40)+(5x+40)=4x+5x+7x

40[2x+3x+5x]=16x

40[10x]=16x

10x=16x/40

10x/16x =40

0.7x = 40

x =40/0.7

x= 57

ANSWER : See the back of the book