Question 169486
1)
x, x+1, x+2, x+3
2x=x+3+12
x=15
.
2)
x, x+1, x+2
x+x+1=x+2+24
2x+1=x+26
x=25
.
3)
x, x+2, x+4
x+x+2=3(x+4)-27
2x+2=3x+12-27
2x+2=3x-15
x=17
.
4)
x, x+2, x+4
x+2(x+2)=x+4+20
x+2x+4=x+24
3x+4=x+24
2x=20
x=10
.
Ed