Writing Equations
six is equal to the difference of a number and eighteen
6=n-18
Kim has $450 in the bank. After buying groceries, she has $398.72 left in her account. How much did she spend at the grocery store?
398.72 + d = 450
$51.28
Is the given number a solution to the equation?
9x=72
x=8
Yes
56+x=100
x = 44
4x=16
x = 4
the product of fourty and a number is one-hundred-twenty
40 x t = 120
Mary ran 27 miles last week, which was three times as far as Jada ran. How far did Jada run?
3m=27
m=9 miles
6c = 24
c = 4
x + 136=203
x = 67
x - 64=28
x = 92
Five is equal to three less than twice a number
5=2x-3
Ben had $x in the bank. He withdrew $104. Now he has $42. How much did he start off with?
x-104=42
$146
Write and solve an equation:
Andre's school has 20 clubs, which is five times as many as his cousin's school. His cousin's school has x clubs.
20=5x
x=4 Clubs
36 = 4r
r = 9
10x=50
x = 5
Fifty times a number cubed is two hundred
50 x t3 = 200
Mrs. Jacobs purchased 48 ounces of candy for her class. Each student gets 4 ounces. How many students are in Mrs. Jacobs' class?
4x = 48
12 students
Is the given number a solution to the equation?
x + 12=15
x=27
no
x - 503=253
x = 756
2x=8
x = 4
The difference of a number and three, divided by two is equal to six
(n-3) / 2 = 6
Hilda can run one mile in 7.5 minutes. How far can she run in 67.5 minutes? Write and solve the equation
7.5x = 67.5
9 Miles
z/6 =12
z = 72
Show the first step of solving this equation.
5x=625
Divide by 5 on both sides.
5x/5=625/5
The area of a classroom is 84 feet2. The formula for area is A= L x W. If the length of the room is 12 feet what is the width.
84= 12w
width=7 feet