The first step of solving a story problem is labeling variables. For this problem, I will label the variables as:

x = Height of Jefferson Square Tower

y = Height of Lincoln Galleria

z = Height of Washington Center

Since we have three variables, we need to find at least three equations from the story problem.

The first sentence says that the Jefferson Square Tower (x) is (=) twice as tall (X 2) as the Lincoln Galleria (y). That produces the equation:

x = 2y

The second part of the sentence says that Washington Center (z) is (=) 120 feet taller (+120) than the Lincoln Galleria (y). That produces the equation:

z = 120 + y

The final statement is that the total height (x + y + z) is (=) 1800. That produces the equation:

x + y + z = 1800

Now that we have three equations, we can use substitution method to solve for our answers.

x + y + z = 1800 Equation 3

2y + y + z = 1800 Substitute the value of x in equation 1 into equation 3

3y + z = 1800 Simplify

3y + 120 + y = 1800 Substitute the value of z in equation 2 into the equatoin

4y + 120 = 1800 Simplify

4y + 120 - 120 = 1800 -120 Subtract 120 from each side

4y = 1680 Simplify

4y/4 = 1680/4 Divide each side by 4

y = 420 Simplify

x = 2y Equation 1

x = 2(420) Substitution

x = 840 Simplify

z = 120 + y Equation 2

z = 120 + 420 Substitution

z = 540 Simplify

Therefore, the height of Jefferson Square Tower is 840 feet, the height of Lincoln Galleria is 420 feet, and the height of Washington Center is 540 feet.

## Comments

My answer won't post so I'll try to put it in the comments section instead.

1) If the total height is 1800, that means that all the heights add up to 1800. Since we don't know any of the heights, we need to give them variable names. We'll call Jefferson Square Tower x, Lincoln Galleria y, and Washington Center z. If we use these variable names with the statement that the total is 1800 we obtain the formula:

x + y + z = 1800

2) Since this formula has three variables, it is unsolvable. We need to get it down to one variable. To do this we will need the other information given in the problem. The problem says: "...Jefferson Square Tower is twice as tall as Lincoln Galleria..." We can translate this to a formula by using our variable names and putting = where "is" was and 2* where "twice" is. Using this method, we obtain:

x = 2*y

Now we need to use the same method for "...Washington Center is 120 feet taller than Lincoln Galleria." (120 feet taller means 120 +) We get the formula:

z = 120 + y

3) Now we need to use substitution and simplify the original equation so we can solve it. Our two equations tell us that we can put 2*y wherever x is and 120 + y wherever z is. If we do this to our original formula (x + z + y = 1800), we get:

2*y + y + 120 + y = 1800

Now we can solve this because we only have one variable (y). Now let's add up all the like terms.

4*y + 120 = 1800

Now we solve for y by getting y on its own side with no numbers. We need to make sure we do the same thing to both sides.

4*y + 120 -120 = 1800 - 120 (subtract 120 from both sides)

(4*y)/4 = 1680/4 (divide both sides by 4)

y = 420

So the height of the Lincoln Galleria is 420ft.

4) Now use our formulas (x = 2*y and z = 120 + y) for each other building to find their heights. But now we know what y equals (420) so we can put that in instead of y.

x = 2*420 = 840

So the Jefferson Square Tower is 840ft tall.

z = 120 + 420 = 540

So the Washington Center is 540ft tall.

My answer won;t post so I will try to put it in the comments section instead.

1) If the total height is 1800, that means that all the heights add up to 1800. Since we don't know any of the heights, we need to give them variable names. We'll call Jefferson Square Tower x, Lincoln Galleria y, and Washington Center z. If we use these variable names with the statement that the total is 1800 we obtain the formula:

x + y + z = 1800

2) Since this formula has three variables, it is unsolvable. We need to get it down to one variable. To do this we will need the other information given in the problem. The problem says: "...Jefferson Square Tower is twice as tall as Lincoln Galleria..." We can translate this to a formula by using our variable names and putting = where "is" was and 2* where "twice" is. Using this method, we obtain:

x = 2*y

Now we need to use the same method for "...Washington Center is 120 feet taller than Lincoln Galleria." (120 feet taller means 120 +) We get the formula:

z = 120 + y

3) Now we need to use substitution and simplify the original equation so we can solve it. Our two equations tell us that we can put 2*y wherever x is and 120 + y wherever z is. If we do this to our original formula (x + z + y = 1800), we get:

2*y + y + 120 + y = 1800

Now we can solve this because we only have one variable (y). Now let's add up all the like terms.

4*y + 120 = 1800

Now we solve for y by getting y on its own side with no numbers. We need to make sure we do the same thing to both sides.

4*y + 120 -120 = 1800 - 120 (subtract 120 from both sides)

(4*y)/4 = 1680/4 (divide both sides by 4)

y = 420

So the height of the Lincoln Galleria is 420ft.

4) Now use our formulas (x = 2*y and z = 120 + y) for each other building to find their heights. But now we know what y equals (420) so we can put that in instead of y.

x = 2*420 = 840

So the Jefferson Square Tower is 840ft tall.

z = 120 + 420 = 540

So the Washington Center is 540ft tall.

No answers....yet!! That's your answer in three different emails???