Question

A construction contractor received two deliveries of building supplies from a lumberyard. The two deliveries included 10 boxes of nails, which coast a total of $110.
Question: write and solve an equation to determine n, the cost in dollars of one box of nails.

Answer 1

To solve this problem you must apply the proccedure shown below:

 1. You have that the 10 boxes of nails that were included in the two deliveries,had a total cost of $110.
 2. Therefore, you can calculate the cost in dollars of one box of nails (n), as following:

 "n" is the cost of one box of nails.

 10n=110
 n=110/10
 n=11 dollars