19. In Figures 9a, 96, 9c and 9d, AOB is a straight line. Determine x.
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Answer:
1)64+2x=180
180-64=2x
116/2=x
58=xAns
2) 2x+2x+x=180
180/5=x
36=x
A/Q
¡)2x=2×36=72
¡¡) 72
¡¡¡) x=36
3) 2x-5+x-3+x=180
2x+x+x-5-3=180
4x=180+8
x= 172/4
x=43
A/Q
¡) 2x-5=(2×43)-5
= 86-5
=81
¡¡) x-3 =43-3=40
¡¡¡) x= 43...
3) 6x+40+5x-10+4x-30=180
15x+30-30=180
+&- cancel So,
15x=180
x= 180/15
x= 12
¡) 6x+40= 6×12+40= 72+40= 102
¡¡) 5x-10= 5×12-10= 60-10=50
¡¡¡) 4x-30= 4×12-30= 48-30= 418 Ans
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