Question

what value of x would make AOB a straight line the two angles are 7x+20,3x
options:-
a)12°
b)16°
c)14°
d)18°
please answer fast...​

Answer 1

$\huge\underline{\bf \orange{Solution :}}$

AOB is a straight line that means sum of angles is 180°

$\sf \implies 7x + 20 + 3x = 180 \\ \\ \sf \implies 10x = 180 - 20 \\ \\ \sf \implies 10x = 160 \\ \\\sf \implies x = \frac{160}{10} \\ \\\implies \underline{ \boxed{ \sf x = 16\degree}}$

$\Large\underline{ \sf \green{\therefore Option \: (b)\: 16° \: is \: correct}}$