Question

Find the answer for the question 20th

Answer 1

$\huge\rm\underline\pink{Solution:-}$

Given ratio = 6:4:5

Let x = 6x , y = 4x , Z = 5x

$\large\rm\bold{\boxed{Sum\:of\:angles\:on\:straight\:line\:is\:180°}}$

$\large\rm{\implies{x+y+z\:=\:180}}$

$\large\rm{\implies{6x+4x+5x\:=\:180}}$

$\large\rm{\implies{15x\:=\:180}}$

$\large\rm{\implies{x\:=\:\frac{180}{15}\:=\:12}}$

x = 6x = 6(12) = 72°

y = 4x = 4(12) = 48°

z = 5x = 5(12) = 60°

∴ x + y = 72° + 48° = 120°

Option(A) is correct

Answer 2

Step-by-step explanation:

20.

AOB is a straight line

so, <AOB = 180°

and, x:y:z = 6:4:5

so,

x = 180°×[6/(6+4+5)]

= [180×6/15]°

= 72°

y = [180×4/15]°

= 48°

z = [180×5/15]°

= 60°

now, the value of (x+y) = (72°+48°) = 120°

so, the answer is option A. 120°

I hope it is a helpful answer......