Jodie is one unit (= Cindy) plus an extra 7 kg. Together they are 81 kg.

Cindy?Jodie?781 kg

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

  1. 2 units + 7 → 81 kg
  2. 2 units → 81 − 7 = 74 kg
  3. 1 unit (Cindy) → 74 ÷ 2 = 37 kg

Cindy weighs 37 kg.

Check: Jodie 44 + Cindy 37 = 81 kg, and 44 − 37 = 7 kg. ✓