For example: 1: 2 = 6: x

Solution x=2*6

x= 12

The product of inner term is equal to the product of outer term, and this characteristic is used to solve the proportional equation.

proportion

For example: 3x=4*6

x=24/3

x=8

1.(a+5)/3 = 12a+5 = 36a = 3 1

2.(B-2)/4= 1

B-2=4

B=6

3.(3+Y)/5=5

3+Y=25

Y=22

4.(8-N)/2=3

8-N=6

N=2

5.(Y-5)/2= 1/2

Y-5= 1

Y=6

6.3/ 10A+6= 12

3/ 10A=6

A=20

I hope my answer can help you, please adopt it in time.