## alainabbyboo22 Group Title 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? 2 years ago 2 years ago

1. alainabbyboo22

2. alainabbyboo22

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

3. alainabbyboo22

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

4. Chlorophyll

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

5. alainabbyboo22

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

6. ganeshie8

Shadow its same as x in ur pix

7. alainabbyboo22

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

8. ganeshie8

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

9. ganeshie8

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

10. alainabbyboo22

S/400 = 150/S

11. alainabbyboo22

correct or incorrect ?

12. Chlorophyll

You divide it :(

13. ganeshie8

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

14. ganeshie8

does 20 cancel on left side ?

15. ganeshie8

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

16. ganeshie8

simplify right side

17. Chlorophyll

@alainabbyboo22 Learn to multiply, will you !