Question

The total cost of a pair of skates and kneepads

is $63. The scates cost $45. Write an equation to
describe this scenario. When you are done, use mental math to give me the value of the variable.

Answer 1

The cost of the knee pad is $18.

Explanation:

It is given that,

The total cost of a skates and knee pads is $63.

Therefore, Total cost = cost of skates + cost of knee pads.

We know that, the cost of the skates is $45.

To find the cost of the knee pads :

Let 'x' be the cost of the knee pads.

The equation is framed with the variable 'x' that gives the cost of the knee pad.

The equation is 63 = 45 + x.

To find the value of x :

The first step is to subtract 45 from both sides of the equation.

⇒ 63-45 = 45+x-45

⇒ 18 = x

⇒ x = 18 dollars.

The cost of the knee pad is $18.