Question

Tìm x: 25%.x+1phan2.x=12

Answer 1

25%.x+1/2.x=12

=> 1/4.x+1/2.x=12

=> x.(1/4+1/2)=12

=> x.0,75       =12

=> x              =12:0,75

=> x              =16

Vậy x=16

Answer 2

25/100.x + 1/2.x = 12

1/10.x + 1/2.x =12 

(1/10 + 1/2 ).x =12

( 1/10 + 5/10 ).x =12

6/10 = 3/5.x = 12

               x = 12 : 3/5

                x = 12 . 5/3

                x = 20