Word Problems: Expressions

Write an algebraic expression for:

three times a number plus 16

• 3(16) + n

• 16n + 3

• 3n + 16

Kalia buys 5 items that cost d dollars each. She gives the cashier $60. Which expression represents the change she should receive?

• 60 − 5d

• 60 − d

• 60 + 5d

• 5d − 60

Translate the sentence into an equation.
Seven subtracted from n is 18 

• n + 7 = 18
• 7 - n = 18
• n - 7 = 18
• n + 7 = 18n

Translate the sentence into an equation:
Four more than six times a number is 18.

• 4 + 6x = 18
• 4x + 6 = 18
• 6x + 4 = 18
• not enough info

Translate this phrase into an algebraic equation:

A number tripled subtracted from 60 is the same as 21.

• 3c − 60 = 21

• 60 − 3 = 21c

• 60 − 3c = 21

• c(60 − 3) = 21

Translate this phrase into an algebraic equation:

Twice the difference of a number and 16 is equivalent to 28.

• 2x + 16 = 28

• 2x - 16 = 28

• 2(x + 16) = 28

• 2(x - 16) = 28

For a walk-a-thon a sponsor committed to give you a flat fee of $5 plus $2 for every mile m you walk. Write an expression for the total amount you will collect from your sponsor at the end of the walk-athon.

• 5+2

• 5+2m

• 5m+2

• 5-2m

• 2m-5

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

10 less that half a number is equivalent to 8.  

• 10 - 1⁄2x = 8 
• 1⁄2x + 10 = 8
• 1⁄2x - 10 = 8
• 10x - 0.5 = 8

Five less than twice a number is equivalent to 47. 

• 5 - 2x = 47 
• 2x - 5 = 47 
• 5x - 2 = 47 
• 2 - 5x = 47