The apple is half the mango, so apple = 1 unit and mango = 2 units. Together = 3 units = 870 g.

Apple1Mango11870 g

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

  1. 3 units → 870 g
  2. 1 unit → 870 ÷ 3 = 290 g
  3. Mango = 2 units → 2 × 290 = 580 g

The mango weighs 580 g.

Check: apple 290 + mango 580 = 870 g. ✓