Question 294690
let the three consequitive numbers be x,  x+2 , x+4

4times the first number decreased by 28

=4x-28

this is equal to sum of second two numbers

x+2 and x+4

4x-28=x+4 +x+2

4x-28=2x+6

4x-2x= 28+6

2x=34

x=17

So the numbers are 17,19,21