New Revised Standard Version
All were amazed and perplexed, saying to one another, “What does this mean?”

Contemporary English Version
Everyone was excited and confused. Some of them even kept asking each other, "What does all this mean?"

New American Bible
They were all astounded and bewildered, and said to one another, “What does this mean?”

Douay-Rheims Bible
And they were all astonished, and wondered, saying one to another: What meaneth this?

And they were all astonished, and wondered, saying one to another: What meaneth this?

What.

Acts 10:17 Now, whilst Peter was doubting within himself what the vision that he had seen should mean, behold the men who were sent from Cornelius, inquiring for Simon's house, stood at the gate.

Acts 17:20 For thou bringest in certain new things to our ears. We would know therefore what these things mean.

Luke 15:26 And he called one of the servants, and asked what these things meant.

Luke 18:36 And when he heard the multitude passing by, he asked what this meant.