Question

Alex needs 80 cm of thread for a sewing project. The thread is on a spool with a circumference of 10 cm. How many times must Alex unwind the spool to get the length of thread he needs?

Answer 1

Alex will need to unwind 8 spools of thread

Explanation:

In order to find out the answer you need to:

Length needed

Circumference

= 80/10

= 8

Hope this helped! :)

Answer 2

Alex must Alex unwind the spool 8 times in order to get the length of thread he needs.

Solution-

The length of the thread needed for sewing project = 80 cm

The length of the thread unwinded with each rotation of the spool = circumference of the spool = 10 cm

So, the number of turns Alex must unwind,

`=\frac{\text{length of thread needed}}{\text{circumference of the spool}}`

`=(80)/(10)\\\\=8`

Therefore, he must unwind 8 times to get the length he needs.