Question

Solve these two problems. Thanks :D

Answer 1

x+10+x-30
=90
2x+10-30=90
2x-20=90
2x=90+20
x= 110/2
=55
a=55+110=65
b=55-30=20


x+10+x-30=180
2x-20=180
2x=180+20
x=200/2
x=100
x+10=110
x-30=70