The graph below shows the mass of a container when it is empty and when different combinations of objects X, Y and Z are placed in it.
Solution
Empty container --> 80g
Y + Z ----- 140g - 80g = 60g
X + Z ----- 300g - 80g = 220g
X + Y ----- 340 g - 80g = 260g
Total of all objects
----- 60g + 220g + 260g = 540g
Average ----- 540g divided by 6 = 90g
Answer: 90g
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