Common Core: 7th Grade Math : Solve Word Problems Leading to Equations: CCSS.Math.Content.7.EE.B.4a

Example Questions

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Example Question #1 : How To Solve Two Step Equations

Let  be the temperature expressed in degrees Celsius. Then the equivalent temperature  in degrees Fahrenheit can be calculated using the formula:

What is  expressed in degrees Fahrenheit?

Explanation:

Example Question #1 : How To Solve Two Step Equations

Let be the temperature expressed in degrees Fahrenheit. Then the equivalent temperature  in degrees Celsius can be calculated using the formula:

What is  expressed in degrees Celsius (to the nearest degree)?

Explanation:

, which rounds to

Example Question #1 : How To Solve Two Step Equations

On average, 1 in 50 apples that grow in an orchard will not be harvested. Of those, half will rot on the ground. If 500 apples are growing in an orchard, how many will rot on the ground?

Explanation:

If there are 500 apples and 1 in 50 will remain unharvested, then we can find the number of unharvested apples by multiplying.

10 apples will remain unharvested. Of those, half will rot on the ground. Multiply to find how many apples rot on the ground.

5 apples will rot on the ground.

Example Question #121 : Problem Solving

Erin is making thirty shirts for her upcoming family reunion. At the reunion she is selling each shirt for $18 apiece. If each shirt cost her$10 apiece to make, how much profit does she make if she only sells 25 shirts at the reunion?

Explanation:

This problem involves two seperate multiplication problems. Erin will make $450 at the reunion but supplies cost her$300 to make the shirts. So her profit is \$150.

Example Question #1 : How To Solve Two Step Equations

Write as an equation:

"Ten added to the product of a number and three is equal to twice the number."

Explanation:

Let  represent the unknown quantity.

The first expression:

"The product of a number and three" is three times this number, or

"Ten added to the product" is

The second expression:

"Twice the number" is two times the number, or

.

The desired equation is therefore

.

Example Question #5 : Solve Word Problems Leading To Equations: Ccss.Math.Content.7.Ee.B.4a

Write as an equation:

Five-sevenths of the difference of a number and nine is equal to forty.

Explanation:

"The difference of a number and nine" is the result of a subtraction of the two, so we write this as

"Five-sevenths of" this difference is the product of  and this, or

This is equal to forty, so write the equation as

Example Question #6 : Solve Word Problems Leading To Equations: Ccss.Math.Content.7.Ee.B.4a

Write as an equation:

Twice the sum of a number and ten is equal to the difference of the number and one half.

Explanation:

Let  represent the unknown number.

"The sum of a number and ten" is the expression . "Twice" this sum is two times this expression, or

.

"The difference of the number and one half" is a subtraction of the two, or

Set these equal, and the desired equation is

Example Question #7 : Solve Word Problems Leading To Equations: Ccss.Math.Content.7.Ee.B.4a

Mark is three times as old as his son Brian. In ten years, Mark will be  years old. In how many years will Mark be twice as old as Brian?

Explanation:

In ten years, Mark will be  years old, so Mark is  years old now, and Brian is one-third of this, or  years old.

Let  be the number of years in which Mark will be twice Brian's age. Then Brian will be , and Mark will be . Since Mark will be twice Brian's age, we can set up and solve the equation:

Mark will be twice Brian's age in  years.

Example Question #1 : Solve Word Problems Leading To Equations: Ccss.Math.Content.7.Ee.B.4a

Gary is twice as old as his niece Candy. How old will Candy will be in five years when Gary is  years old?

Not enough information is given to determine the answer.

Explanation:

Since Gary will be 37 in five years, he is  years old now. He is twice as old as Cathy, so she is  years old, and in five years, she will be  years old.

Example Question #9 : Solve Word Problems Leading To Equations: Ccss.Math.Content.7.Ee.B.4a

If a rectangle possesses a width of  and has a perimeter of , then what is the length?

Explanation:

In order to solve this problem, we need to recall the formula for perimeter of a rectangle:

We can substitute in our known values and solve for our unknown variable (i.e. length):

We want to isolate the  to one side of the equation. In order to do this, we will first subtract  from both sides of the equation.

Next, we can divide each side by

The length of the rectangle is

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