Choosing Equations from Real World Problems

WRITE AN EQUATION
Aiyana had some candy to give to her four cousins. She first took ten pieces for herself and then evenly divided the rest among her cousins. Each child received two pieces. Write the equation to solve this question correctly.

• (x-10)/4=2

• x-10/4=2

• x-10=2(4)

• 2(x-10)=4

After paying $3.32 for a sandwich, Sabiha has $19.79. How much money did she start with? Which equation could you use to solve this problem?

• 3.32s = 19.79

• s - 19.97 = 3.32

• s - 3.32 = 19.79

In 2010, a tree was 8 feet tall. In 2011 the tree was 14 feet tall. Which equation would be used to find how many feet the tree grew?

• f + 8 = 14

• f - 8 = 14

• f/8 = 14

• 8f=14

WRITE AN EQUATION
Phoebe spent half of her weekly allowance playing mini-golf. To earn more money her parents let her wash the car for $4. What is her weekly allowance if she ended with $12?

• 0.5x+4=12

• x+4=12

• 12-4=x

• 12-4=0.5x

The Roaming Cell Phone Company charges $15.00 per month plus $0.20 per minute of airtime usage.  If Juanita uses x minutes of airtime, what is an equation that can be used to determine her monthly cell phone bill (C)?

• C = 0.20x + 15

• C =15 (0.20x)

• C = 15 + x + 0.20

• C = 0.20 + 15x

The Blake Upper School ordered two copiers plus a supply of toner cartridges. Each copier cost $675, and each cartridge cost $80. If the total cost was $2,310, how many cartridges were ordered?

• 20 cartridges were ordered.

• 21 cartridges were ordered.

• 12 cartridges were ordered.

Mrs. Wagner wants to go to the zoo with her extended family. A family membership costs $25 plus an additional $3 for each child’s pass. She spent $37 for a membership and passes. How many child passes did she buy?

• Mrs. Wagner bought 4 child passes.

• Mrs. Wagner bought 3 child passes.

• Mrs. Wagner bought 5 child passes.

Papa John is 50 years old. His age is 2 years more than 3 times the age of Jimmy John. How old is Jimmy John?

• Jimmy John is 16 years old.

• Jimmy John is 17 years old.

• Jimmy John is 18 years old.

• Jimmy John is 19 years old.

Theodore has 41 books in his library.  He bought several books at a yard sale over the weekend. He now has 94 books in his library. How many books did he buy at the yard sale?

• 134

• 53

• 41

• 60

Three fewer than four times a number is five more than twice the number. Find the number.

• 4

• 1

• 2