Real-Life Algebra: Equations with Variables and Constants

A store sells pencils for $0.50 each. If you buy x pencils, how much will you spend? Write an equation to represent the total cost.

• total cost = 0.50 / x

• total cost = 0.50 + x

• total cost = 0.50 * x

• total cost = x + 0.50

Maria has 3 more than twice the number of apples that John has. If John has y apples, write an equation to express the number of apples Maria has.

• 2y + 3

• 3y + 2

• y + 3

• 2y - 3

A car rental company charges a flat fee of $20 plus $0.15 per mile driven. If you drive m miles, write an equation for the total cost of renting the car.

• C = 0.15m

• C = 20 - 0.15m

• C = 20 + 0.10m

• C = 20 + 0.15m

In a classroom, the number of boys is represented by b and the number of girls is g. If there are 5 more girls than boys, write an equation to represent this relationship.

• g = b + 5

• g = 5b

• b = g + 5

• g = b - 5

A recipe requires 2 cups of flour for every 3 cups of sugar. If you have s cups of sugar, how many cups of flour do you need? Write an equation to express this.

• (2/3) * s

• (3/2) * s

• s + 2

• s / 3

Tom is x years old. His sister is 4 years younger than him. Write an equation to find the age of Tom's sister in terms of x.

• x + 2

• x - 4

• x - 2

• x + 4

A gardener plants 5 rows of flowers with r flowers in each row. Write an equation to find the total number of flowers planted.

• total flowers = 5 * r

• total flowers = r / 5

• total flowers = 5 - r

• total flowers = r + 5

A book costs $15, and you have a discount of d dollars. Write an equation to find the final price of the book after the discount.

• final price = 15 - d

• final price = 15 + d

• final price = 15 * d

• final price = d - 15

If a train travels at a speed of 60 miles per hour for t hours, how far does it travel? Write an equation to represent the distance traveled.

• Distance = 60t^2

• Distance = 60t

• Distance = 60/t

• Distance = 60 + t

A box contains x chocolates. If you eat 3 chocolates, how many chocolates are left in the box? Write an equation to express the remaining chocolates.

• x - 3

• 3 - x

• x + 3

• x - 1