a tree is standing by the side of the building. 2/5th of the height of the tree is above the building level. the building is 9 metres high. what is the height of the tree?

If 2/5 of the tree is above the building, the other 3/5 must be down next to the building.3/5(tree) = 9mMultiply each side by 5/3 :tree = (5/3) (9) = 15 meters

9 + ( 2 / 5 )*h = h =>45 + 2h = 5h => 45 = 3h => h = 45 / 3 => h = 15 metres.