Amanda has a piece of ribbon that is 1/4 yard long she wants to share the ribbon with her and 2 friends. if each of the three friends get the same amount how much ribbon will each person get

1/4 x 2

1. Set up the problem,
1/4 x 2/1

2. Flip the second fraction, so it'll turn into 1/2

3. Multiply straight across
1/4 x 1/2 = 1/8

1/8 Would Be The Answer.

 y varies directly with x means y =kx
y varies inversely with z means y =k/z .
 with  k  being a constant

 y varies directly with x and inversely with z
y=kx/z
x=15,z=5 so by putting values
18=15k/5
k=6

So the equation that models the relationship is
y=6x/z
y=6*21/7
y=18
hope this helps