The answer is 25 blue beads.
SOLUTION:
Firstly, we know that the ratio of blue to white beads is 5:1. We now know that one in every 6 beads is white.
When we divide 30 by 6, you will get 5 white beads. Because there are 5 times as many blue beads, we times 5 by 5 to get 25 blue bead
Hope this helps!