Question

Question #869e5

Answer 1

`15` yards

Explanation:

`1` balloon `= 2.5` feet of ribbon.
`18` balloons `= (2.5*18)` feet of ribbon
`18` balloon `= 45` feet of ribbon.

`3` feet = `1` yard.
`45` feet = `45/3=15` yard

Therefore,
`18` balloons need `15` yards of ribbon.