Yellow beads are 1 unit. Red beads are twice as many, so 2 units. One unit is 806 beads.

Plain numbers are given; italic underlined numbers are worked out.

1. 1 unit → 806 (yellow)
2. Red = 2 units → 2 × 806 = 1612

The number of red beads is 1612.

Check: 1612 = 2 × 806. ✓