Step-by-step explanation:
HERE,
angle A=x+5
angle B=3x
angle C=x
we know that,
sum of three angle of a triangle =180°
According to the question,
[tex]\tt{ x+5+3x+x=180 }[/tex]
[tex]\tt{5x+5=180 }[/tex]
[tex]\tt{ 5x=180-5 }[/tex]
[tex]\tt{5x=175 }[/tex]
[tex]\tt{ x=\dfrac{175}{5} }[/tex]
[tex]\tt{x=35 }[/tex]
So,
[tex]\bold{\angle{B}=3x=3×35=105° }[/tex]
