These triangles are similar what is the value of x

Since we know the bigger triangle is 5 times bigger, we can multiply each side from the small triangle by 5 to get the sides of the bigger triangle.

So we know that the side with x on it is supposed to be equal to 20.

So what I did was:
3x+8=20
3x=12
x=4

Hope this helps!! :)

Hey mate here is the answerthe correct answer is b may it will you