Keisha had two pieces of ribbon of equal length. She cut
the first piece of ribbon into 15 equal parts. She also cut the second
piece of ribbon into equal parts. Nine parts of the first piece are
equal in length to 3 parts of the second piece. Into how many parts
did she cut the second piece of ribbon?
"Nine parts of the first piece are
equal in length to 3 parts of the second piece. "
means that each part of the second ribbon is three times as long as each part of the first, which also means that the number of parts of the second ribbon is one-third of the number of parts of the first.
I'll let you take it from here.
1/3*15=5
To find out how many parts Keisha cut the second piece of ribbon into, we can use the ratio of the lengths of the two pieces of ribbon that she cut.
Let's start by figuring out the ratio of lengths between the two pieces of ribbon. According to the problem, 9 parts of the first piece are equal in length to 3 parts of the second piece.
We can express this ratio as 9:3 or simplified as 3:1. This means that for every 3 parts in the first piece, there is 1 part in the second piece.
Now that we have the ratio, we can use it to determine the number of parts in the second piece of ribbon. Since Keisha cut the first piece into 15 equal parts, we can divide 15 by the number on the left side of the ratio (3). This gives us:
15 divided by 3 equals 5.
So, Keisha cut the second piece of ribbon into 5 parts.