At a certain time of day, a 5 foot tall man has a 7.5 foot shadow. If a tree is 20 feet tall, what is the length of the shadow of the tree?

Question

anonymous · Answer

attachment

anonymous · Answer

A.	30 feet
	B.	12 feet
	C.	24 feet
	D.	15 feet

anonymous · Answer

or at least could someone tell me what i need to do to find my answer ? do i multiply to get the length ? divide ?

anonymous · Answer

Apply ratio with S is the length of  the tree shadow:
S/ 20 = 7.5 / 5
=> S = ...?

@alainabbyboo22 Can you continue?

anonymous · Answer

what is "S" supposed to be ? i don't get this ..

ganeshie8 · Answer

Shadow

its same as x in ur pix

anonymous · Answer

oh okay . but no , i'm unable to continue because i'm unsure of how to do this . /:

ganeshie8 · Answer

$\frac{S}{20} = \frac{7.5}{5}$

you need to solve S

ganeshie8 · Answer

for that you need to isolate S,

multiply 20 both sides

anonymous · Answer

S/400 = 150/S

anonymous · Answer

correct or incorrect ?

anonymous · Answer

You divide it :(

ganeshie8 · Answer

$\frac{S}{20} = \frac{7.5}{5}$

multiply 20 both sides

$20*\frac{S}{20} = 20*\frac{7.5}{5}$

ganeshie8 · Answer

does 20 cancel on left side ?

ganeshie8 · Answer

$\cancel{20}*\frac{S}{\cancel{20}} = 20*\frac{7.5}{5}$

ganeshie8 · Answer

simplify right side

anonymous · Answer

@alainabbyboo22 Learn to multiply, will you !