B is 1 unit. A is 2 units (twice B). C is B + 80 = 1 unit + 80. D is the same as A = 2 units. The four bags total 1460 g.<br><br>[[model:questions/solutions/q8370.png]]<br><br>• 1 + 2 + 1 + 2 = 6 units, plus 80 → 1460 g<br>• 6 units → 1460 − 80 = 1380 g<br>• 1 unit (B) → 1380 ÷ 6 = 230 g<br><br>Bag B has a mass of 230 g.<br>Check: B 230 + A 460 + C 310 + D 460 = 1460 g. ✓