10 feet
Joe, Who Is 5 Feet 6 Inches Tall, Casts A Shadow 11 Feet Long. The Shadow Of A Nearby Tree Is 20 Feet Long. How Tall Is The Tree?
I would use ratios.
Let x=height of the tree
FYI 5'6" is = 5.5' (6"/12"=.5)
5.5/11=20/x
Cross multiply
5.5x = 20x11
divide both sides by 5.5
x=20x11/5.5
solve for x and get 40
therefore The Tree is 40' Tall
for downloadable math lessons you might want to have a look at Math Made Simple
Let x=height of the tree
FYI 5'6" is = 5.5' (6"/12"=.5)
5.5/11=20/x
Cross multiply
5.5x = 20x11
divide both sides by 5.5
x=20x11/5.5
solve for x and get 40
therefore The Tree is 40' Tall
for downloadable math lessons you might want to have a look at Math Made Simple
30