Question

A spool of ribbon holds 6.75 meters. A craft club buys 21 spools.

a. What is the total cost if the ribbon sells for $2 per meter?
b. If the club uses 76.54 meters to complete a project, how much ribbon will be left?

Answer 1

a. 141.75 m

b. 65.21 m

Explanation:

One spool = 6.75 m

total ribbon = 21 spools

a) total spool in meter = 6.75×21 = 141.75 m

unit meter cost = 141.75×2 = 283.5 m

b) if the club uses 76.54 m then 141.75- 76.54 m = 65.21 m of ribbon left

Answer 2

a.
`\$283.5`

b.
`65.21\ m`

Explanation:

a. We need to analize the information provided in the exercise.

We know that the ribbon sells for $2 per meter and a spool of ribbon holds 6.75 meters. Therefore, the cost of one spool of ribbon is:

`cost\ of\ one\ spool=(6.75)(\$2)\\\\cost\ of\ one\ spool=\$13.5`

Since the Craft club buys 21 spools, we can calculate the total cost by multiplying the cost of one spool by 21 spools. Then:

`total\ cost=(\$13.5)(21)\\\\total\ cost=\$283.5`

b. We know that one spool of ribbon holds 6.75 meters and the Craft club buys 21 spools, therefore, they amount of meters the Craft club buys is:

`ribbon\ bought=(6.75\ m)(21)=141.75\ m`

Since the club uses 76.54 meters to complete a project, we can calculate the amount of ribbon that will be left by subtracting 141.75 meters and 76.54 meters. Then:

`ribbon\ left=141.75\ m-76.54\ m=65.21\ m`