Question

Mr. Rein is replacing the window panes for one of the classrooms. He buys six panes for $455.40. He breaks 3 of the panes. What is the cost of replacing the three broken panes?

Answer 1

$455.40

Explanation:

You want the cost of 3 panes of glass used if 6 were purchased and 3 of those were broken.

Cost

Mr. Rein spent $455.40 for the material he used to replace window panes in the classroom. He had no usable material left over.

The cost of replacing the three broken panes was $455.40.

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Additional comment

The cost of the breakage is effectively added to the cost of the material used. Each pane brought home from the store cost $75.90. Two were purchased for each one used, so the cost of the one used is effectively 2·$75.90 = $151.80.

Answer 2

$227.70

Explanation:

To solve for the cost of each pane, we can use this expression:

• total cost of all panes ÷ number of panes = cost of each pane

Inserting the numbers into the equation:

• 455.40 ÷ 6 = 75.90

This means that each pane costs $75.90.

Now we can solve for the cost of 3 panes:

75.90 × 3 = 227.70

Therefore, the cost of replacing three broken panes will be $227.70.

(You can also take the total price and divide that by 2)