Question

What is the value of x?

Answer 1

x = 10

Explanation:

90 = 4x + 5x

90= 9x

90 divided by 9 = 10

Answer 2

it is given , angle ABC = 90

then,

5x+4x = 90

9x = 90

x = 90/9

x = 10

first angle is 40

second angle is 50

hope it helps