Question

The students in three classes are in the ratio 2 : 3 : 5. If 20 students are increased in each class, the ratio of changes to 4 : 5 : 7. The total number of students before the increase was

Answer 1

2x + 20 + 3x + 20 + 5x +20 = 4x + 5x + 7x

10x + 60 = 16x

6x = 60

x = 10

2x + 3x + 5x = 20+30+50= 100

Answer 2

Answer:100

Step-by-step explanation:

Answer:100

Step-by-step explanation:

2 : 3: 5 changes to 4:5:7

Ultimate change 2 unit(4-2) (5-3) (7-5)

Then

2 = 20 (number of student new)

1 = 10

(5+3+2)--10 = 10*10=100

2nd mathod

Let guess

2x,3x,5x number of student.

Then

2X + 3X + 5X + 20 +20 +20= 4X+5X+7X

10X+60=16X

6X=60

X=10

FINAL...

TOTAL NUMBER OF STUDENT IS

2×10+ 3×10+5×10=100