Moses reply to them in Numbers 9:8 is instructive. He did not know. He told them to wait, and he would go check with God. He would listen to what the Lord would command about this situation.
He did not try to solve the problem. He did not propose any options. He listened.
Not my first response. My first response is to plan or strategize. Moses listened.
God had an answer.
I wonder how many things I have missed because I did not ask and did not listen. It is relatively difficult to get an answer if I am not listening.