Question

1.5m tall boy stands at a distance of 3m from a lump post and cast a shadow of 4.5m on the ground.Find the height of lump post

Answer 1

did you make a sketch?

If so, you should see the ratio ...

h/7.5 = 1.5/4.5
h = 7.5(1.5)/4.5
= ...

Answer 2

2.5