The larger number is 11 units and the smaller is 1 unit, so their difference is 10 units = 19.5.

Smaller1Largerdifference = 10 units = 19.5

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

  1. Difference → 11 units − 1 unit = 10 units → 19.5
  2. 1 unit → 19.5 ÷ 10 = 1.95
  3. Larger → 11 units = 11 × 1.95 = 21.45

The larger number is 21.45.

Check: 21.45 − 1.95 = 19.5, and 21.45 = 11 × 1.95. ✓