Answer:
"silver bikes" (in the blank)
Explanation:
We need to find forevery orange bike, there are 3 ______ WHAT COLOR BIKE?
For, this we need ratio of CERTAIN COLOR BIKE to ORANGE BIKES. Which ever is 3, is the answer.
Red bikes to orange bikes:
red for every orange
Blue bikes to orange bikes:
blue for every orange
Silver bikes to orange bikes:
silver for every orange
THE LAST ONE IS THE CORRECT ANSWER.