Question 21
The three balances shown are level. Find the combined weight of A, B and C in kilograms.
Scoring note: the source National Star is optional. It earns +10 if correct, loses 10 if wrong or left blank after opting in, and scores 0 if not selected. This practice import has no automatic negative marks and cannot represent opting in; apply the source adjustment manually.
Scoring note: the source National Star is optional. It earns +10 if correct, loses 10 if wrong or left blank after opting in, and scores 0 if not selected. This practice import has no automatic negative marks and cannot represent opting in; apply the source adjustment manually.