The person is 6 feet tall and casts a
shadow of 3 feet. The building casts a
shadow of 20. Which ratio can be used to
calculate the height of the building?

6/3 = x/20

Step-by-step explanation:

Hi, to answer this question we have to analyze the information given:

The person is 6 feet tall and casts a shadow of 3 feet.

The ratio is: height of the person/ shadow length = 6/3

For a 20 ft shadow:

x /20

So:

Height of the person / shadow of the person= height of the building / shadow of the building

6/3 = x/20

Solving for x:

6/3 (20) = x

x = 40 feet

Feel free to ask for more if needed or if you did not understand something.  

she made 48 + y = a cookies.     not enough info is given to find the total.

to find the unit price of an object, you divide the price by object. you are trying to find out how much an object cost per unit.

for instance, lets say you have 50lb of ice cream(object) that cost 8.00 dollars(price). to find the unit cost, we take the 8.00 and divide it by 50, which will give us .16 cents per pound. we can check this by multiplying .16 by 50 = 8.00

so

object = e2

price = d2

unit price = c2

formula for c2:

=d2 / e2

so in my example about ice cream, we would have the following.

e2 = 50

d2 = 8.00

c2 formula:

=d2 / e2