Question

pls explain the 5th one

Answer 1

In a quadilateral the angles add up to  360

Let's call the angles  

3 x +4x+5x +6x = 360

18x = 360

x = 360 / 18 = 20    then the angles are 60 , 80 ,100 ,120    check .. 60 +80+100+120 = 360

Answer 2

5th ques=

Given ratio 5:3

So let the length of shadow be x

A/q

5/3=80/x

As 5/3 is length of pole to shadow

5x=80×3

X=(80×3)/5

X=48m