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The answer to the second question on page 28 of the first volume of the eighth grade math book
X= 180-90-50=40

X=( 180-40)/2=70

X+(X+ 10)+[ 180-(X+70)]= 180

X+X+ 10+ 180-X-70 = 190

2X = 190- 10- 180+70

? x=70/2

? x=35

X+(X+ 10)=360-60-90

X+X+ 10=2 10

2X =2 10- 10

x= 100

x+x+(x+20)+(x- 10)=540-70

X+X+X+20+X- 10？ =470

? 4x？ =470+ 10-20

x =460/4

x= 1 15

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