Equations Word Problems

A plumber charges $50 to make a house call plus $40 for each hour worked. What is the expression and what does he make if he worked 5 hours?

• 50x + 40; $290

• 50x + 40x; $450

• 50 + 40x; $250

• 90x; $450

What could this represent? 7x + 2 = 30

• Buying pet turtles for $7 each plus two cans of turtle food cost $30.

• Seven bags of candy plus 2 extra snickers bars equals 30 dollars.

• Two yoyos plus seven frisbees is thirty cents.

• Buying seven calculators plus $2 per bundle of pencils is $30.

If ChipCo sold their bags of corn chips for $5 per bag plus $1 for bagging it and it costs the same as $4 per bag of CrunchyChips corn chips plus their price of $2 for bagging it, what would the equation be and how many bags of chips would make them cost the same?

• 5 + 1x = 2x + 4; 1 bag of chips

• 9x = 3; 3 bags of chips

• 5x + 1 = 4x + 2; 1 bag of chips

• 5x = 6x; -1 bag of chips

Six decreased by twice a number.

• 2x - 6

• 6 < 2x

• 6 - x

• 6 - 2x

Nine times the sum of a number and three

• 9 ( 3x )

• 9 ( x + 3 )

• 9 ( x - 3 )

• 9x (3)

Mario had 102 dollars to spend on 9 books. After buying them he had 21 dollars. How much did each book cost ?

• $9

• $10

• $8

• $11

Last month, Kyeisha made $480 working for 30 hours. This month, she will get a 15% increase in the amount she earns per hour. What will be her hourly rate, in dollars per hour, after the raise?

• $480

• $2.40

• $18.40

• $15.00

Josh is thinking of two numbers.  Their sum is -10 and their difference is -2.  Which system of equations represents the situation?

• x - y = -10
  x + y = -2

• x = -2 
  y = 5

• x + y = -2
  x - y = -10

• x + y = -10
  x - y = -2

Write an Equation.
Grandma is knitting a scarf. She has knit 10 inches of the scarf and still has 38 inches left to finish. How long will the scarf be when it is completed?

• x − 10 = 38

• x + 10 = 38

• x/10 = 38

• 10x = 38