Red = 7 units, yellow = 1 unit, so all 112 roses make 8 units.

Red14141414141414Yellow14112 roses

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

  1. Total → 7 + 1 = 8 units → 112
  2. 1 unit → 112 ÷ 8 = 14
  3. More red than yellow → 7 units − 1 unit = 6 units = 6 × 14 = 84

There are 84 more red roses than yellow roses.

Check: red 98 + yellow 14 = 112; 98 − 14 = 84. ✓