John is 12 units, Gilbert 7 units, Ken 10 units. John has 6 more stickers than Ken, which is 2 units.<br><br>[[model:questions/solutions/q4488.png]]<br><br>• Difference between John and Ken → 12 − 10 = 2 units<br>• 2 units → 6 stickers<br>• $$\frac{1}{1}$$ unit → 6 ÷ 2 = 3<br>• Total units → 12 + 7 + 10 = 29<br>• Total stickers → 29 × 3 = 87<br><br>They have 87 stickers altogether.<br>Check: John = 36, Gilbert = 21, Ken = 30. John − Ken = 6. Total = 87. ✓