1) 11+8>x+5>11-8
19>x+5>3
19-5>x>3+5
14>x>8
x = (8;14)
2) 130-x= 6x-24. 6x-24=130-x=130-22=108
130+24= 6x+x.
154=7x
x=154:7
x= 22
3) 4x+5x=360. 4x=4*40=160
9x=360. 5x=5*40=200
x=360:9
x=40
4) 270-90%
x - 100%
x = 270*100:90= 300
5) b=1 4/2= 2 +
b=2. 5/4 -
b=3. 6/6=1 +
b=4. 7/8 -
1 and 3
1) 11+8>x+5>11-8
19>x+5>3
19-5>x>3+5
14>x>8
x = (8;14)
2) 130-x= 6x-24. 6x-24=130-x=130-22=108
130+24= 6x+x.
154=7x
x=154:7
x= 22
3) 4x+5x=360. 4x=4*40=160
9x=360. 5x=5*40=200
x=360:9
x=40
4) 270-90%
x - 100%
x = 270*100:90= 300
5) b=1 4/2= 2 +
b=2. 5/4 -
b=3. 6/6=1 +
b=4. 7/8 -
1 and 3